Merge branch 'master' into local_windows_panes

# Conflicts:
#	cmd-switch-client.c

.github/workflows/lock.yml

@@ -17,8 +17,9 @@ jobs:
   action:
     runs-on: ubuntu-latest
     if: github.repository == 'tmux/tmux'
+    timeout-minutes: 10
     steps:
-      - uses: dessant/lock-threads@v6
+      - uses: dessant/lock-threads@89ae32b08ed1a541efecbab17912962a5e38981c # v6
         with:
           github-token: ${{ github.token }}
           issue-inactive-days: '30'

.github/workflows/regress.yml

@@ -38,7 +38,9 @@ jobs:
 
     steps:
       - name: checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+        with:
+          persist-credentials: false
 
       - name: dependencies
         if: runner.os == 'Linux'
@@ -81,7 +83,7 @@ jobs:
 
       - name: logs
         if: failure()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: regress-logs-${{ matrix.name }}
           path: regress/logs/*.log

Makefile.am

@@ -85,6 +85,7 @@ endif
 
 # List of sources.
 dist_tmux_SOURCES = \
+	active.c \
 	alerts.c \
 	arguments.c \
 	attributes.c \

active.c

@@ -0,0 +1,737 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2026 Nicholas Marriott <nicholas.marriott@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+
+#include "tmux.h"
+
+/* Local last-window stack entry. */
+struct active_window_entry {
+	u_int					window;
+	TAILQ_ENTRY(active_window_entry)	entry;
+};
+
+/* Local last-window stack. */
+TAILQ_HEAD(active_window_stack, active_window_entry);
+
+/* Per-client and per-session local active window state. */
+struct active_window {
+	struct client			*client;
+	struct session			*session;
+
+	u_int				 window;
+	struct active_window_stack	 lastw;
+
+	RB_ENTRY(active_window)		 entry;
+};
+RB_HEAD(active_windows, active_window);
+
+/* Pane entry in a client-local last-pane stack. */
+struct active_pane_entry {
+	struct window_pane		*wp;
+	TAILQ_ENTRY(active_pane_entry)	 entry;
+};
+TAILQ_HEAD(active_pane_stack, active_pane_entry);
+
+/* Per-client and per-window local active pane state. */
+struct active_pane {
+	struct client			*client;
+	struct window			*window;
+	enum active_mode		 mode;
+	struct window_pane		*pane;
+	struct active_pane_stack	 last_panes;
+
+	RB_ENTRY(active_pane)	 entry;
+};
+RB_HEAD(active_panes, active_pane);
+
+/* Compare local active window states by client and session. */
+static int
+active_window_cmp(struct active_window *aw1, struct active_window *aw2)
+{
+	uintptr_t	c1 = (uintptr_t)aw1->client;
+	uintptr_t	c2 = (uintptr_t)aw2->client;
+	uintptr_t	s1 = (uintptr_t)aw1->session;
+	uintptr_t	s2 = (uintptr_t)aw2->session;
+
+	if (c1 < c2)
+		return (-1);
+	if (c1 > c2)
+		return (1);
+	if (s1 < s2)
+		return (-1);
+	if (s1 > s2)
+		return (1);
+	return (0);
+}
+RB_GENERATE_STATIC(active_windows, active_window, entry, active_window_cmp);
+
+/* Compare local active pane states by client and window. */
+static int
+active_pane_cmp(struct active_pane *ap1, struct active_pane *ap2)
+{
+	uintptr_t	c1 = (uintptr_t)ap1->client;
+	uintptr_t	c2 = (uintptr_t)ap2->client;
+	uintptr_t	w1 = (uintptr_t)ap1->window;
+	uintptr_t	w2 = (uintptr_t)ap2->window;
+
+	if (c1 < c2)
+		return (-1);
+	if (c1 > c2)
+		return (1);
+	if (w1 < w2)
+		return (-1);
+	if (w1 > w2)
+		return (1);
+	return (0);
+}
+RB_GENERATE_STATIC(active_panes, active_pane, entry, active_pane_cmp);
+
+/* All local active window states. */
+static struct active_windows active_windows = RB_INITIALIZER(&active_windows);
+
+/* All local active pane states. */
+static struct active_panes active_panes = RB_INITIALIZER(&active_panes);
+
+/* Find local active window state for a client and session. */
+static struct active_window *
+active_window_get(struct client *c, struct session *s)
+{
+	struct active_window	aw;
+
+	if (c == NULL || s == NULL)
+		return (NULL);
+	aw.client = c;
+	aw.session = s;
+	return (RB_FIND(active_windows, &active_windows, &aw));
+}
+
+/* Add local active window state for a client and session. */
+static struct active_window *
+active_window_add(struct client *c, struct session *s, struct winlink *wl)
+{
+	struct active_window	*aw;
+
+	aw = active_window_get(c, s);
+	if (aw == NULL) {
+		aw = xcalloc(1, sizeof *aw);
+		aw->client = c;
+		aw->session = s;
+		TAILQ_INIT(&aw->lastw);
+		RB_INSERT(active_windows, &active_windows, aw);
+	}
+	if (wl != NULL)
+		aw->window = wl->window->id;
+	return (aw);
+}
+
+/* Remove a window from a local last-window stack. */
+static void
+active_window_stack_remove(struct active_window_stack *stack, u_int window)
+{
+	struct active_window_entry	*awe, *awe1;
+
+	TAILQ_FOREACH_SAFE(awe, stack, entry, awe1) {
+		if (awe->window == window) {
+			TAILQ_REMOVE(stack, awe, entry);
+			free(awe);
+		}
+	}
+}
+
+/* Push a window onto a local last-window stack. */
+static void
+active_window_stack_push(struct active_window_stack *stack, u_int window)
+{
+	struct active_window_entry	*awe;
+
+	active_window_stack_remove(stack, window);
+	awe = xcalloc(1, sizeof *awe);
+	awe->window = window;
+	TAILQ_INSERT_HEAD(stack, awe, entry);
+}
+
+/* Free local active window state. */
+static void
+active_window_free(struct active_window *aw)
+{
+	struct active_window_entry	*awe;
+
+	while (!TAILQ_EMPTY(&aw->lastw)) {
+		awe = TAILQ_FIRST(&aw->lastw);
+		TAILQ_REMOVE(&aw->lastw, awe, entry);
+		free(awe);
+	}
+	RB_REMOVE(active_windows, &active_windows, aw);
+	free(aw);
+}
+
+/* Resolve local active window state to a valid winlink. */
+static struct winlink *
+active_window_resolve(struct active_window *aw)
+{
+	struct winlink	*wl, *next;
+	u_int		 window;
+
+	if (aw == NULL || aw->session->curw == NULL)
+		return (NULL);
+
+	wl = winlink_find_by_window_id(&aw->session->windows, aw->window);
+	if (wl != NULL)
+		return (wl);
+
+	while (!TAILQ_EMPTY(&aw->lastw)) {
+		window = TAILQ_FIRST(&aw->lastw)->window;
+
+		next = winlink_find_by_window_id(&aw->session->windows, window);
+		active_window_stack_remove(&aw->lastw, window);
+		if (next != NULL) {
+			aw->window = next->window->id;
+			return (next);
+		}
+	}
+
+	aw->window = aw->session->curw->window->id;
+	return (aw->session->curw);
+}
+
+/* Notify the server that a client's effective window changed. */
+static void
+active_window_changed(struct client *c, struct session *s, struct winlink *wl,
+    struct winlink *old)
+{
+	struct event_payload	*ep;
+	struct cmd_find_state	 fs;
+
+	if (wl == NULL || wl == old)
+		return;
+
+	if (options_get_number(global_options, "focus-events")) {
+		if (old != NULL)
+			window_update_focus(old->window);
+		window_update_focus(wl->window);
+	}
+	winlink_clear_flags(wl);
+	window_update_activity(wl->window);
+	tty_update_window_offset(wl->window);
+
+	if (c != NULL && c->session == s)
+		wl->window->latest = c;
+
+	ep = event_payload_create();
+	cmd_find_from_winlink(&fs, wl, 0);
+	event_payload_set_target(ep, &fs);
+	event_payload_set_client(ep, "client", c);
+	event_payload_set_session(ep, "session", s);
+	event_payload_set_window(ep, "window", wl->window);
+	event_payload_set_window(ep, "new_window", wl->window);
+	event_payload_set_int(ep, "window_index", wl->idx);
+	event_payload_set_int(ep, "new_window_index", wl->idx);
+	if (old != NULL) {
+		event_payload_set_window(ep, "old_window", old->window);
+		event_payload_set_int(ep, "old_window_index", old->idx);
+	}
+	events_fire("client-window-changed", ep);
+
+	if (c != NULL) {
+		c->flags |= CLIENT_REDRAWWINDOW|CLIENT_REDRAWSTATUS|
+		    CLIENT_REDRAWBORDERS;
+		tty_update_client_offset(c);
+		status_update_cache(s);
+	}
+	recalculate_sizes();
+}
+
+/* Find local active pane state for a client and window. */
+static struct active_pane *
+active_pane_get(struct client *c, struct window *w)
+{
+	struct active_pane	ap;
+
+	if (c == NULL || w == NULL)
+		return (NULL);
+	ap.client = c;
+	ap.window = w;
+	return (RB_FIND(active_panes, &active_panes, &ap));
+}
+
+/* Add local active pane state for a client and window. */
+static struct active_pane *
+active_pane_add(struct client *c, struct window *w)
+{
+	struct active_pane	*ap;
+
+	ap = active_pane_get(c, w);
+	if (ap == NULL) {
+		ap = xcalloc(1, sizeof *ap);
+		ap->client = c;
+		ap->window = w;
+		TAILQ_INIT(&ap->last_panes);
+		RB_INSERT(active_panes, &active_panes, ap);
+	}
+	return (ap);
+}
+
+/* Remove a pane from a client-local last-pane stack. */
+static void
+active_pane_stack_remove(struct active_pane *ap,
+    struct window_pane *wp)
+{
+	struct active_pane_entry	*ape, *ape1;
+
+	TAILQ_FOREACH_SAFE(ape, &ap->last_panes, entry, ape1) {
+		if (ape->wp == wp) {
+			TAILQ_REMOVE(&ap->last_panes, ape, entry);
+			free(ape);
+		}
+	}
+}
+
+/* Push a pane onto a client-local last-pane stack. */
+static void
+active_pane_stack_push(struct active_pane *ap, struct window_pane *wp)
+{
+	struct active_pane_entry	*ape;
+
+	if (wp == NULL)
+		return;
+	active_pane_stack_remove(ap, wp);
+	ape = xcalloc(1, sizeof *ape);
+	ape->wp = wp;
+	TAILQ_INSERT_HEAD(&ap->last_panes, ape, entry);
+}
+
+/* Free local active pane state. */
+static void
+active_pane_free(struct active_pane *ap)
+{
+	struct active_pane_entry	*ape, *ape1;
+
+	RB_REMOVE(active_panes, &active_panes, ap);
+	TAILQ_FOREACH_SAFE(ape, &ap->last_panes, entry, ape1) {
+		TAILQ_REMOVE(&ap->last_panes, ape, entry);
+		free(ape);
+	}
+	free(ap);
+}
+
+/* Check whether a pane can be the effective pane for a window. */
+static int
+active_pane_valid(struct window *w, struct window_pane *wp)
+{
+	if (w == NULL || wp == NULL || wp->window != w)
+		return (0);
+	if (!window_has_pane(w, wp))
+		return (0);
+	if (w->modal != NULL && wp != w->modal)
+		return (0);
+	return (1);
+}
+
+/* Get the shared pane for a window, accounting for modal panes. */
+static struct window_pane *
+active_pane_default(struct window *w)
+{
+	if (w == NULL)
+		return (NULL);
+	if (w->modal != NULL)
+		return (w->modal);
+	return (w->active);
+}
+
+/* Return if a client has local window selection for a session. */
+int
+active_is_local_window(struct client *c, struct session *s)
+{
+	return (active_window_get(c, s) != NULL);
+}
+
+/* Make a client use local or shared window selection for a session. */
+void
+active_set_local_window(struct client *c, struct session *s,
+    enum active_mode mode)
+{
+	struct active_window	*aw;
+	struct winlink		*wl, *old;
+
+	if (c == NULL || s == NULL || s->curw == NULL)
+		return;
+
+	old = active_get_effective_winlink(c, s);
+	if (mode == ACTIVE_LOCAL) {
+		active_window_add(c, s, old);
+		if (c != NULL && c->session == s)
+			c->flags |= CLIENT_REDRAWSTATUS;
+		return;
+	}
+
+	aw = active_window_get(c, s);
+	if (aw != NULL) {
+		active_window_free(aw);
+		wl = active_get_effective_winlink(c, s);
+		active_window_changed(c, s, wl, old);
+		if (c != NULL && c->session == s)
+			c->flags |= CLIENT_REDRAWSTATUS;
+	}
+}
+
+/* Return the effective winlink for a client and session. */
+struct winlink *
+active_get_effective_winlink(struct client *c, struct session *s)
+{
+	struct active_window	*aw;
+
+	if (s == NULL)
+		return (NULL);
+	aw = active_window_get(c, s);
+	if (aw != NULL)
+		return (active_window_resolve(aw));
+	return (s->curw);
+}
+
+/* Return the effective window for a client and session. */
+struct window *
+active_get_effective_window(struct client *c, struct session *s)
+{
+	struct winlink	*wl;
+
+	wl = active_get_effective_winlink(c, s);
+	if (wl == NULL)
+		return (NULL);
+	return (wl->window);
+}
+
+/* Select a winlink for a client and session. */
+int
+active_select_window(struct client *c, struct session *s, struct winlink *wl)
+{
+	struct active_window	*aw;
+	struct winlink		*old;
+	int			 changed;
+
+	if (wl == NULL)
+		return (-1);
+	aw = active_window_get(c, s);
+	if (aw == NULL)
+		return (session_set_current(s, wl));
+
+	old = active_window_resolve(aw);
+	if (old == wl)
+		return (1);
+	if (old != NULL)
+		active_window_stack_push(&aw->lastw, old->window->id);
+	active_window_stack_remove(&aw->lastw, wl->window->id);
+	aw->window = wl->window->id;
+	changed = (old != wl);
+	active_window_changed(c, s, wl, old);
+	return (changed ? 0 : 1);
+}
+
+/* Select a window by index. */
+int
+active_select_window_index(struct client *c, struct session *s, int idx)
+{
+	struct winlink	*wl;
+
+	wl = winlink_find_by_index(&s->windows, idx);
+	return (active_select_window(c, s, wl));
+}
+
+/* Select the next window. */
+int
+active_next_window(struct client *c, struct session *s, int alert)
+{
+	struct winlink	*wl;
+
+	wl = active_get_effective_winlink(c, s);
+	if (wl == NULL)
+		return (-1);
+	do {
+		wl = winlink_next(wl);
+		if (wl == NULL)
+			wl = RB_MIN(winlinks, &s->windows);
+		if (!alert || (wl->flags & WINLINK_ALERTFLAGS))
+			return (active_select_window(c, s, wl));
+	} while (wl != active_get_effective_winlink(c, s));
+	return (-1);
+}
+
+/* Select the previous window. */
+int
+active_previous_window(struct client *c, struct session *s, int alert)
+{
+	struct winlink	*wl;
+
+	wl = active_get_effective_winlink(c, s);
+	if (wl == NULL)
+		return (-1);
+	do {
+		wl = winlink_previous(wl);
+		if (wl == NULL)
+			wl = RB_MAX(winlinks, &s->windows);
+		if (!alert || (wl->flags & WINLINK_ALERTFLAGS))
+			return (active_select_window(c, s, wl));
+	} while (wl != active_get_effective_winlink(c, s));
+	return (-1);
+}
+
+/* Select the last window. */
+int
+active_last_window(struct client *c, struct session *s)
+{
+	struct active_window	*aw;
+	struct winlink		*wl;
+	u_int			 window;
+
+	aw = active_window_get(c, s);
+	if (aw == NULL)
+		return (session_last(s));
+	while (!TAILQ_EMPTY(&aw->lastw)) {
+		window = TAILQ_FIRST(&aw->lastw)->window;
+
+		wl = winlink_find_by_window_id(&s->windows, window);
+		if (wl != NULL)
+			return (active_select_window(c, s, wl));
+		active_window_stack_remove(&aw->lastw, window);
+	}
+	return (-1);
+}
+
+/* Return if this winlink is the effective winlink. */
+int
+active_is_effective_window(struct client *c, struct session *s,
+    struct winlink *wl)
+{
+	return (wl != NULL && wl == active_get_effective_winlink(c, s));
+}
+
+/* Return if this winlink is the last effective winlink. */
+int
+active_is_last_window(struct client *c, struct session *s, struct winlink *wl)
+{
+	struct active_window		*aw;
+	struct active_window_entry	*awe;
+
+	if (wl == NULL)
+		return (0);
+	aw = active_window_get(c, s);
+	if (aw == NULL)
+		return (wl == TAILQ_FIRST(&s->lastw));
+	TAILQ_FOREACH(awe, &aw->lastw, entry) {
+		if (winlink_find_by_window_id(&s->windows, awe->window) == NULL)
+			continue;
+		return (wl->window->id == awe->window);
+	}
+	return (0);
+}
+
+/* Return if a client has local pane selection for a window. */
+int
+active_has_local_pane(struct client *c, struct window *w)
+{
+	struct active_pane	*ap;
+
+	ap = active_pane_get(c, w);
+	return (ap != NULL && ap->mode == ACTIVE_LOCAL);
+}
+
+/* Make a client use local or shared pane selection for a window. */
+void
+active_set_pane_mode(struct client *c, struct window *w, enum active_mode mode)
+{
+	struct active_pane	*ap;
+	struct window_pane	*wp;
+
+	if (c == NULL || w == NULL)
+		return;
+	if (mode == ACTIVE_SHARED) {
+		ap = active_pane_get(c, w);
+		if (ap != NULL)
+			ap->mode = ACTIVE_SHARED;
+		server_redraw_client(c);
+		server_status_client(c);
+		return;
+	}
+
+	if (server_client_how_many() < 2) {
+		ap = active_pane_get(c, w);
+		if (ap != NULL)
+			ap->mode = ACTIVE_SHARED;
+		server_redraw_client(c);
+		server_status_client(c);
+		return;
+	}
+
+	wp = active_get_effective_pane(c, w);
+	if (wp == NULL)
+		wp = active_pane_default(w);
+	ap = active_pane_add(c, w);
+	ap->mode = ACTIVE_LOCAL;
+	ap->pane = wp;
+	server_redraw_client(c);
+	server_status_client(c);
+}
+
+/* Return the effective active pane for a client and window. */
+struct window_pane *
+active_get_effective_pane(struct client *c, struct window *w)
+{
+	struct active_pane	*ap;
+	struct window_pane	*wp;
+
+	wp = active_pane_default(w);
+	ap = active_pane_get(c, w);
+	if (ap == NULL || ap->mode != ACTIVE_LOCAL)
+		return (wp);
+	if (!active_pane_valid(w, ap->pane)) {
+		ap->pane = wp;
+		if (wp != NULL)
+			active_pane_stack_remove(ap, wp);
+		return (wp);
+	}
+	return (ap->pane);
+}
+
+/* Return the effective last pane for a client and window. */
+struct window_pane *
+active_get_last_pane(struct client *c, struct window *w)
+{
+	struct active_pane		*ap;
+	struct active_pane_entry	*ape, *ape1;
+
+	if (!active_has_local_pane(c, w))
+		return (w == NULL ? NULL : TAILQ_FIRST(&w->last_panes));
+
+	ap = active_pane_get(c, w);
+	TAILQ_FOREACH_SAFE(ape, &ap->last_panes, entry, ape1) {
+		if (active_pane_valid(w, ape->wp))
+			return (ape->wp);
+		TAILQ_REMOVE(&ap->last_panes, ape, entry);
+		free(ape);
+	}
+	return (NULL);
+}
+
+/* Select a pane using either shared or local state. */
+int
+active_set_pane(struct client *c, struct window *w, struct window_pane *wp,
+    int notify)
+{
+	struct active_pane	*ap;
+	struct window_pane	*lastwp;
+
+	if (!active_pane_valid(w, wp))
+		return (0);
+	if (!active_has_local_pane(c, w))
+		return (window_set_active_pane(w, wp, notify));
+
+	lastwp = active_get_effective_pane(c, w);
+	if (wp == lastwp)
+		return (0);
+
+	ap = active_pane_add(c, w);
+	active_pane_stack_remove(ap, wp);
+	active_pane_stack_push(ap, lastwp);
+	ap->pane = wp;
+
+	if (c != NULL) {
+		server_redraw_client(c);
+		server_status_client(c);
+	}
+	return (1);
+}
+
+/* Remove all local pane state if fewer than two clients remain. */
+void
+active_check_clients(void)
+{
+	struct active_pane	*ap, *ap1;
+
+	if (server_client_how_many() >= 2)
+		return;
+
+	RB_FOREACH_SAFE(ap, active_panes, &active_panes, ap1) {
+		if (ap->mode == ACTIVE_LOCAL) {
+			server_redraw_client(ap->client);
+			server_status_client(ap->client);
+		}
+		active_pane_free(ap);
+	}
+}
+
+/* Remove all state for a client. */
+void
+active_remove_client(struct client *c)
+{
+	struct active_window	*aw, *aw1;
+	struct active_pane		*ap, *ap1;
+
+	RB_FOREACH_SAFE(aw, active_windows, &active_windows, aw1) {
+		if (aw->client == c)
+			active_window_free(aw);
+	}
+	RB_FOREACH_SAFE(ap, active_panes, &active_panes, ap1) {
+		if (ap->client == c)
+			active_pane_free(ap);
+	}
+}
+
+/* Remove all window state for a session. */
+void
+active_remove_session(struct session *s)
+{
+	struct active_window	*aw, *aw1;
+
+	RB_FOREACH_SAFE(aw, active_windows, &active_windows, aw1) {
+		if (aw->session == s)
+			active_window_free(aw);
+	}
+}
+
+/* Remove a window from all local state. */
+void
+active_remove_window(struct window *w)
+{
+	struct active_window	*aw;
+	struct active_pane		*ap, *ap1;
+
+	RB_FOREACH(aw, active_windows, &active_windows) {
+		active_window_stack_remove(&aw->lastw, w->id);
+		if (aw->window == w->id && aw->session->curw != NULL)
+			aw->window = aw->session->curw->window->id;
+	}
+	RB_FOREACH_SAFE(ap, active_panes, &active_panes, ap1) {
+		if (ap->window == w)
+			active_pane_free(ap);
+	}
+}
+
+/* Remove a pane from all local pane state. */
+void
+active_remove_pane(struct window_pane *wp)
+{
+	struct active_pane	*ap, *ap1;
+
+	RB_FOREACH_SAFE(ap, active_panes, &active_panes, ap1) {
+		active_pane_stack_remove(ap, wp);
+		if (ap->pane == wp)
+			ap->pane = NULL;
+	}
+}

alerts.c

@@ -314,7 +314,7 @@ alerts_set_message(struct winlink *wl, const char *type, const char *option)
 			tty_putcode(&c->tty, TTYC_BEL);
 		if (visual == VISUAL_OFF)
 			continue;
-		if (c->session->curw == wl) {
+		if (active_get_effective_winlink(c, c->session) == wl) {
 			status_message_set(c, -1, 1, 0, 0,
 			    "%s in current window", type);
 		} else {

cmd-attach-session.c

@@ -93,7 +93,7 @@ cmd_attach_session(struct cmdq_item *item, const char *tflag, int dflag,
 	if (wl != NULL) {
 		if (wp != NULL)
 			window_set_active_pane(wp->window, wp, 1);
-		session_set_current(s, wl);
+		active_select_window(c, s, wl);
 		if (wp != NULL)
 			cmd_find_from_winlink_pane(current, wl, wp, 0);
 		else

cmd-break-pane.c

@@ -93,14 +93,18 @@ cmd_break_pane_exec(struct cmd *self, struct cmdq_item *item)
 	struct cmd_find_state	*current = cmdq_get_current(item);
 	struct cmd_find_state	*target = cmdq_get_target(item);
 	struct cmd_find_state	*source = cmdq_get_source(item);
+	struct client		*c = cmdq_get_client(item);
 	struct client		*tc = cmdq_get_target_client(item);
+	struct client		*ac;
 	struct winlink		*wl = source->wl;
+	struct winlink		*current_wl;
 	struct session		*src_s = source->s;
 	struct session		*dst_s = target->s;
 	struct window_pane	*wp = source->wp;
 	struct window		*w = wl->window, *old_w = w;
 	char			*cause, *cp;
 	int			 idx = target->idx, before, old_idx = wl->idx;
+	int			 detached, local;
 	const char		*template, *name = args_get(args, 'n');
 
 	if (wp == w->modal) {
@@ -117,11 +121,18 @@ cmd_break_pane_exec(struct cmd *self, struct cmdq_item *item)
 	}
 
 	before = args_has(args, 'b');
+	ac = tc;
+	if (ac == NULL || ac->session != dst_s)
+		ac = c;
+	detached = args_has(args, 'd');
+	local = (!detached && active_is_local_window(ac, dst_s));
 	if (args_has(args, 'a') || before) {
 		if (target->wl != NULL)
 			idx = winlink_shuffle_up(dst_s, target->wl, before);
-		else
-			idx = winlink_shuffle_up(dst_s, dst_s->curw, before);
+		else {
+			current_wl = active_get_effective_winlink(ac, dst_s);
+			idx = winlink_shuffle_up(dst_s, current_wl, before);
+		}
 		if (idx == -1)
 			return (CMD_RETURN_ERROR);
 	}
@@ -129,7 +140,7 @@ cmd_break_pane_exec(struct cmd *self, struct cmdq_item *item)
 
 	if (window_count_panes(w, 1) == 1) {
 		if (server_link_window(src_s, wl, dst_s, idx, 0,
-		    !args_has(args, 'd'), &cause) != 0) {
+		    !detached && !local, &cause) != 0) {
 			cmdq_error(item, "%s", cause);
 			free(cause);
 			return (CMD_RETURN_ERROR);
@@ -142,6 +153,13 @@ cmd_break_pane_exec(struct cmd *self, struct cmdq_item *item)
 		wl = winlink_find_by_window(&dst_s->windows, w);
 		if (wl == NULL)
 			return (CMD_RETURN_ERROR);
+		if (local) {
+			active_select_window(ac, dst_s, wl);
+			if (ac != NULL && ac->session == dst_s)
+				cmd_find_from_client(current, ac, 0);
+			if (ac != NULL && ac->session == dst_s)
+				server_redraw_client(ac);
+		}
 		window_fire_pane_moved(wp, old_w, old_idx, w, wl->idx);
 		goto out;
 	}
@@ -185,9 +203,17 @@ cmd_break_pane_exec(struct cmd *self, struct cmdq_item *item)
 	window_remove_ref(w, __func__);
 	events_fire_window("window-created", w);
 	window_fire_pane_moved(wp, old_w, old_idx, w, wl->idx);
-	if (!args_has(args, 'd')) {
-		session_select(dst_s, wl->idx);
-		cmd_find_from_session(current, dst_s, 0);
+	if (!detached) {
+		if (local)
+			active_select_window(ac, dst_s, wl);
+		else
+			session_select(dst_s, wl->idx);
+		if (local && ac != NULL && ac->session == dst_s)
+			cmd_find_from_client(current, ac, 0);
+		else
+			cmd_find_from_session(current, dst_s, 0);
+		if (local && ac != NULL && ac->session == dst_s)
+			server_redraw_client(ac);
 	}
 
 	server_redraw_session(src_s);

cmd-display-menu.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: cmd-display-menu.c,v 1.52 2026/07/14 19:07:03 nicm Exp $ */
+/* $OpenBSD: cmd-display-menu.c,v 1.53 2026/08/31 07:46:55 nicm Exp $ */
 
 /*
  * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -483,7 +483,7 @@ cmd_display_menu_exec(struct cmd *self, struct cmdq_item *item)
 	char			*title, *cause = NULL;
 	int			 flags = 0, starting_choice = 0;
 	u_int			 px, py, i, count = args_count(args);
-	struct options		*o = target->s->curw->window->options;
+	struct options		*o = target->w->options;
 	struct options_entry	*oe;
 
 	if (args_has(args, 'C')) {
@@ -584,13 +584,15 @@ cmd_display_popup_exec(struct cmd *self, struct cmdq_item *item)
 	u_int			 px, py, w, h, count = args_count(args);
 	struct args_value	*av;
 	struct environ		*env = NULL;
-	struct options		*o = s->curw->window->options;
+	struct options		*o = target->w->options;
 	struct options_entry	*oe;
 
 	if (args_has(args, 'C')) {
 		server_client_clear_overlay(tc);
 		return (CMD_RETURN_NORMAL);
 	}
+	if (tc->flags & CLIENT_CONTROL)
+		return (CMD_RETURN_NORMAL);
 	if (!modify && tc->overlay_draw != NULL)
 		return (CMD_RETURN_NORMAL);
 

cmd-find.c

@@ -884,13 +884,13 @@ cmd_find_from_client(struct cmd_find_state *fs, struct client *c, int flags)
 	if (c->session != NULL) {
 		cmd_find_clear_state(fs, flags);
 
-		fs->wp = c->session->curw->window->active;
+		fs->wl = active_get_effective_winlink(c, c->session);
+		fs->wp = active_get_effective_pane(c, fs->wl->window);
 		if (fs->wp == NULL) {
 			cmd_find_from_session(fs, c->session, flags);
 			return (0);
 		}
 		fs->s = c->session;
-		fs->wl = fs->s->curw;
 		fs->w = fs->wl->window;
 
 		cmd_find_log_state(__func__, fs);
@@ -931,6 +931,57 @@ unknown_pane:
 	return (cmd_find_from_nothing(fs, flags));
 }
 
+/* Find state from mouse target. */
+static int
+cmd_find_target_from_mouse(struct cmd_find_state *fs, struct cmdq_item *item,
+    enum cmd_find_type type)
+{
+	struct mouse_event	*m = &cmdq_get_event(item)->m;
+	struct client		*c = cmdq_get_client(item);
+	struct client		*tc = cmdq_get_target_client(item);
+
+	switch (type) {
+	case CMD_FIND_PANE:
+		if (m->s != -1 && m->w == -1 && m->wp == -1 &&
+		    (fs->s = session_find_by_id(m->s)) != NULL) {
+			if (tc != NULL && tc->session == fs->s)
+				fs->wl = active_get_effective_winlink(tc, fs->s);
+			else if (c != NULL && c->session == fs->s)
+				fs->wl = active_get_effective_winlink(c, fs->s);
+			else
+				fs->wl = fs->s->curw;
+			if (fs->wl != NULL) {
+				fs->w = fs->wl->window;
+				fs->wp = fs->w->active;
+				break;
+			}
+		}
+		fs->wp = cmd_mouse_pane(m, &fs->s, &fs->wl);
+		if (fs->wp != NULL) {
+			fs->w = fs->wl->window;
+			break;
+		}
+		/* FALLTHROUGH */
+	case CMD_FIND_WINDOW:
+	case CMD_FIND_SESSION:
+		fs->wl = cmd_mouse_window(m, &fs->s);
+		if (fs->s != NULL && m->w == -1 &&
+		    tc != NULL && tc->session == fs->s)
+			fs->wl = active_get_effective_winlink(tc, fs->s);
+		else if (fs->s != NULL && m->w == -1 &&
+		    c != NULL && c->session == fs->s)
+			fs->wl = active_get_effective_winlink(c, fs->s);
+		if (fs->wl == NULL && fs->s != NULL)
+			fs->wl = fs->s->curw;
+		if (fs->wl != NULL) {
+			fs->w = fs->wl->window;
+			fs->wp = fs->w->active;
+		}
+		break;
+	}
+	return (fs->wp == NULL ? -1 : 0);
+}
+
 /*
  * Split target into pieces and resolve for the given type. Fills in the given
  * state. Returns 0 on success or -1 on error.
@@ -939,7 +990,6 @@ int
 cmd_find_target(struct cmd_find_state *fs, struct cmdq_item *item,
     const char *target, enum cmd_find_type type, int flags)
 {
-	struct mouse_event	*m;
 	struct client		*c;
 	struct cmd_find_state	 current;
 	char			*colon, *period, *copy = NULL, tmp[256];
@@ -1015,35 +1065,15 @@ cmd_find_target(struct cmd_find_state *fs, struct cmdq_item *item,
 			cmdq_error(item, "no current client");
 			goto error;
 		}
-		fs->wl = c->session->curw;
-		fs->wp = c->session->curw->window->active;
-		fs->w = c->session->curw->window;
+		fs->wl = active_get_effective_winlink(c, c->session);
+		fs->wp = fs->wl->window->active;
+		fs->w = fs->wl->window;
 		goto found;
 	}
 
 	/* Mouse target is a plain = or {mouse}. */
 	if (strcmp(target, "=") == 0 || strcmp(target, "{mouse}") == 0) {
-		m = &cmdq_get_event(item)->m;
-		switch (type) {
-		case CMD_FIND_PANE:
-			fs->wp = cmd_mouse_pane(m, &fs->s, &fs->wl);
-			if (fs->wp != NULL) {
-				fs->w = fs->wl->window;
-				break;
-			}
-			/* FALLTHROUGH */
-		case CMD_FIND_WINDOW:
-		case CMD_FIND_SESSION:
-			fs->wl = cmd_mouse_window(m, &fs->s);
-			if (fs->wl == NULL && fs->s != NULL)
-				fs->wl = fs->s->curw;
-			if (fs->wl != NULL) {
-				fs->w = fs->wl->window;
-				fs->wp = fs->w->active;
-			}
-			break;
-		}
-		if (fs->wp == NULL) {
+		if (cmd_find_target_from_mouse(fs, item, type) != 0) {
 			if (~flags & CMD_FIND_QUIET)
 				cmdq_error(item, "no mouse target");
 			goto error;

cmd-join-pane.c

@@ -413,13 +413,16 @@ cmd_join_pane_exec(struct cmd *self, struct cmdq_item *item)
 	struct cmd_find_state	*current = cmdq_get_current(item);
 	struct cmd_find_state	*target = cmdq_get_target(item);
 	struct cmd_find_state	*source = cmdq_get_source(item);
+	struct client		*c = cmdq_get_client(item);
+	struct client		*tc = cmdq_get_target_client(item);
+	struct client		*ac;
 	struct session		*dst_s;
 	struct winlink		*src_wl, *dst_wl;
 	struct window		*src_w, *dst_w;
 	struct window_pane	*src_wp, *dst_wp;
 	const char		*s;
 	char			*cause = NULL;
-	int			 flags = 0, dst_idx;
+	int			 flags = 0, dst_idx, local;
 	struct layout_cell	*lc;
 
 	dst_s = target->s;
@@ -427,6 +430,10 @@ cmd_join_pane_exec(struct cmd *self, struct cmdq_item *item)
 	dst_wp = target->wp;
 	dst_w = dst_wl->window;
 	dst_idx = dst_wl->idx;
+	ac = tc;
+	if (ac == NULL || ac->session != dst_s)
+		ac = c;
+	local = active_is_local_window(ac, dst_s);
 
 	if (cmd_get_entry(self) == &cmd_move_pane_entry) {
 		if (args_has(args, 'M'))
@@ -512,9 +519,18 @@ cmd_join_pane_exec(struct cmd *self, struct cmdq_item *item)
 
 	if (!args_has(args, 'd')) {
 		window_set_active_pane(dst_w, src_wp, 1);
-		session_select(dst_s, dst_idx);
-		cmd_find_from_session(current, dst_s, 0);
-		server_redraw_session(dst_s);
+		if (local)
+			active_select_window(ac, dst_s, dst_wl);
+		else
+			session_select(dst_s, dst_idx);
+		if (local && ac != NULL && ac->session == dst_s)
+			cmd_find_from_client(current, ac, 0);
+		else
+			cmd_find_from_session(current, dst_s, 0);
+		if (local && ac != NULL && ac->session == dst_s)
+			server_redraw_client(ac);
+		else
+			server_redraw_session(dst_s);
 	} else
 		server_status_session(dst_s);
 

cmd-move-window.c

@@ -62,12 +62,15 @@ cmd_move_window_exec(struct cmd *self, struct cmdq_item *item)
 	struct args		*args = cmd_get_args(self);
 	struct cmd_find_state	*source = cmdq_get_source(item);
 	struct cmd_find_state	 target;
+	struct client		*c = cmdq_get_client(item);
+	struct client		*tc = cmdq_get_target_client(item);
+	struct client		*ac;
 	const char		*tflag = args_get(args, 't');
 	struct session		*src = source->s;
 	struct session		*dst;
-	struct winlink		*wl = source->wl;
+	struct winlink		*wl = source->wl, *dstwl, *current_wl;
 	char			*cause;
-	int			 idx, kflag, dflag, sflag, before;
+	int			 idx, kflag, dflag, sflag, before, local;
 
 	if (args_has(args, 'r')) {
 		if (cmd_find_target(&target, item, tflag, CMD_FIND_SESSION,
@@ -90,23 +93,37 @@ cmd_move_window_exec(struct cmd *self, struct cmdq_item *item)
 	dflag = args_has(args, 'd');
 	sflag = args_has(args, 's');
 
+	ac = tc;
+	if (ac == NULL || ac->session != dst)
+		ac = c;
+	local = (!dflag && active_is_local_window(ac, dst));
+
 	before = args_has(args, 'b');
 	if (args_has(args, 'a') || before) {
 		if (target.wl != NULL)
 			idx = winlink_shuffle_up(dst, target.wl, before);
-		else
-			idx = winlink_shuffle_up(dst, dst->curw, before);
+		else {
+			current_wl = active_get_effective_winlink(ac, dst);
+			idx = winlink_shuffle_up(dst, current_wl, before);
+		}
 		if (idx == -1)
 			return (CMD_RETURN_ERROR);
 	}
 
-	if (server_link_window(src, wl, dst, idx, kflag, !dflag, &cause) != 0) {
+	if (server_link_window(src, wl, dst, idx, kflag, !dflag && !local,
+	    &cause) != 0) {
 		cmdq_error(item, "%s", cause);
 		free(cause);
 		return (CMD_RETURN_ERROR);
 	}
+	dstwl = winlink_find_by_window(&dst->windows, wl->window);
 	if (cmd_get_entry(self) == &cmd_move_window_entry)
 		server_unlink_window(src, wl);
+	if (local && dstwl != NULL) {
+		active_select_window(ac, dst, dstwl);
+		if (ac != NULL && ac->session == dst)
+			server_redraw_client(ac);
+	}
 
 	/*
 	 * Renumber the winlinks in the src session only, the destination

cmd-new-window.c

@@ -58,9 +58,11 @@ cmd_new_window_exec(struct cmd *self, struct cmdq_item *item)
 	struct cmd_find_state	*target = cmdq_get_target(item);
 	struct spawn_context	 sc = { 0 };
 	struct client		*tc = cmdq_get_target_client(item);
+	struct client		*ac;
 	struct session		*s = target->s;
 	struct winlink		*wl = target->wl, *new_wl = NULL;
 	int			 idx = target->idx, before, count = args_count(args);
+	int			 detached, local;
 	char			*cause = NULL, *cp, *expanded, *wname = NULL;
 	const char		*template, *name;
 	struct cmd_find_state	 fs;
@@ -107,10 +109,15 @@ cmd_new_window_exec(struct cmd *self, struct cmdq_item *item)
 			free(wname);
 			if (args_has(args, 'd'))
 				return (CMD_RETURN_NORMAL);
-			if (session_set_current(s, new_wl) == 0)
-				server_redraw_session(s);
+			if (active_select_window(c, s, new_wl) == 0) {
+				if (active_is_local_window(c, s) && c != NULL &&
+				    c->session == s)
+					server_redraw_client(c);
+				else
+					server_redraw_session(s);
+			}
 			if (c != NULL && c->session != NULL)
-				s->curw->window->latest = c;
+				active_get_effective_window(c, s)->latest = c;
 			recalculate_sizes();
 			return (CMD_RETURN_NORMAL);
 		}
@@ -140,10 +147,16 @@ cmd_new_window_exec(struct cmd *self, struct cmdq_item *item)
 	sc.idx = idx;
 	sc.cwd = args_get(args, 'c');
 
+	ac = tc;
+	if (ac == NULL || ac->session != s)
+		ac = c;
+	detached = args_has(args, 'd');
+	local = (!detached && active_is_local_window(ac, s));
+
 	sc.flags = 0;
 	if (args_has(args, 'E') || (count == 1 && *args_string(args, 0) == '\0'))
 		sc.flags |= SPAWN_EMPTY;
-	if (args_has(args, 'd'))
+	if (detached || local)
 		sc.flags |= SPAWN_DETACHED;
 	if (args_has(args, 'k'))
 		sc.flags |= SPAWN_KILL;
@@ -153,7 +166,13 @@ cmd_new_window_exec(struct cmd *self, struct cmdq_item *item)
 		free(cause);
 		goto fail;
 	}
-	if (!args_has(args, 'd') || new_wl == s->curw) {
+	if (local) {
+		if (active_select_window(ac, s, new_wl) == 0)
+			cmd_find_from_winlink(current, new_wl, 0);
+		if (ac != NULL && ac->session == s)
+			server_redraw_client(ac);
+		server_status_session_group(s);
+	} else if (!detached || new_wl == s->curw) {
 		cmd_find_from_winlink(current, new_wl, 0);
 		server_redraw_session_group(s);
 	} else

cmd-parse.y

@@ -1,4 +1,4 @@
-/* $OpenBSD: cmd-parse.y,v 1.58 2026/04/27 12:31:11 nicm Exp $ */
+/* $OpenBSD: cmd-parse.y,v 1.59 2026/08/31 07:51:56 nicm Exp $ */
 
 /*
  * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -802,6 +802,7 @@ cmd_parse_expand_alias(struct cmd_parse_command *cmd,
 	if (last == NULL) {
 		pr->status = CMD_PARSE_SUCCESS;
 		pr->cmdlist = cmd_list_new();
+		cmd_parse_free_commands(cmds);
 		return (1);
 	}
 
@@ -814,6 +815,7 @@ cmd_parse_expand_alias(struct cmd_parse_command *cmd,
 	pi->flags |= CMD_PARSE_NOALIAS;
 	cmd_parse_build_commands(cmds, pi, pr);
 	pi->flags &= ~CMD_PARSE_NOALIAS;
+	cmd_parse_free_commands(cmds);
 	return (1);
 }
 

cmd-refresh-client.c

@@ -203,7 +203,7 @@ cmd_refresh_client_exec(struct cmd *self, struct cmdq_item *item)
 		if (args_has(args, 'c'))
 			tc->pan_window = NULL;
 		else {
-			w = tc->session->curw->window;
+			w = active_get_effective_window(tc, tc->session);
 			if (tc->pan_window != w) {
 				tc->pan_window = w;
 				tc->pan_ox = tty->oox;

cmd-resize-pane.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: cmd-resize-pane.c,v 1.67 2026/07/10 13:38:45 nicm Exp $ */
+/* $OpenBSD: cmd-resize-pane.c,v 1.68 2026/08/31 07:44:39 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -92,6 +92,7 @@ cmd_resize_pane_exec(struct cmd *self, struct cmdq_item *item)
 		return (CMD_RETURN_NORMAL);
 	}
 	server_unzoom_window(w);
+	lc = wp->layout_cell; /* may have been replaced by unzoom */
 
 	if (args_has(args, 'x')) {
 		x = args_percentage(args, 'x', 0, PANE_MAXIMUM, w->sx, &cause);

cmd-run-shell.c

@@ -79,7 +79,10 @@ static void
 cmd_run_shell_print(struct job *job, const char *msg)
 {
 	struct cmd_run_shell_data	*cdata = job_get_data(job);
+	struct client			*c = cdata->client;
+	struct session			*s;
 	struct window_pane		*wp = NULL;
+	struct window			*w;
 	struct cmd_find_state		 fs;
 	struct window_mode_entry	*wme;
 
@@ -90,8 +93,11 @@ cmd_run_shell_print(struct job *job, const char *msg)
 			cmdq_print(cdata->item, "%s", msg);
 			return;
 		}
-		if (cdata->client != NULL && cdata->client->session != NULL)
-			wp = cdata->client->session->curw->window->active;
+		if (c != NULL && c->session != NULL) {
+			s = c->session;
+			w = active_get_effective_window(c, s);
+			wp = active_get_effective_pane(c, w);
+		}
 		if (wp == NULL && cmd_find_from_nothing(&fs, 0) == 0)
 			wp = fs.wp;
 		if (wp == NULL)

cmd-select-pane.c

@@ -33,8 +33,8 @@ const struct cmd_entry cmd_select_pane_entry = {
 	.name = "select-pane",
 	.alias = "selectp",
 
-	.args = { "DdegLlMmP:RT:t:UZ", 0, 0, NULL }, /* -P and -g deprecated */
-	.usage = "[-DdeLlMmRUZ] [-T title] " CMD_TARGET_PANE_USAGE,
+	.args = { "DdegLlMmP:RsST:t:UZ", 0, 0, NULL }, /* -P and -g deprecated */
+	.usage = "[-DdeLlMmRsSUZ] [-T title] " CMD_TARGET_PANE_USAGE,
 
 	.target = { 't', CMD_FIND_PANE, 0 },
 
@@ -68,10 +68,11 @@ cmd_select_pane_redraw(struct window *w)
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session == NULL || (c->flags & CLIENT_CONTROL))
 			continue;
-		if (c->session->curw->window == w && tty_window_bigger(&c->tty))
+		if (active_get_effective_window(c, c->session) == w &&
+		    tty_window_bigger(&c->tty))
 			server_redraw_client(c);
 		else {
-			if (c->session->curw->window == w)
+			if (active_get_effective_window(c, c->session) == w)
 				c->flags |= CLIENT_REDRAWBORDERS;
 			if (session_has(c->session, w))
 				c->flags |= CLIENT_REDRAWSTATUS;
@@ -84,6 +85,7 @@ static enum cmd_retval
 cmd_select_pane_marked_pane(struct cmd *self, struct cmdq_item *item)
 {
 	struct args		*args = cmd_get_args(self);
+	struct client		*c = cmdq_get_client(item);
 	struct cmd_find_state	*target = cmdq_get_target(item);
 	struct event_payload	*ep;
 	struct cmd_find_state	 fs;
@@ -137,8 +139,9 @@ cmd_select_pane_marked_pane(struct cmd *self, struct cmdq_item *item)
 		server_status_window(mwp->window);
 	}
 	if (window_pane_is_floating(wp)) {
-		window_redraw_active_switch(wp->window, wp);
-		window_set_active_pane(wp->window, wp, 1);
+		if (!active_has_local_pane(c, wp->window))
+			window_redraw_active_switch(wp->window, wp);
+		active_set_pane(c, wp->window, wp, 1);
 	}
 	return (CMD_RETURN_NORMAL);
 }
@@ -152,26 +155,40 @@ cmd_select_pane_exec(struct cmd *self, struct cmdq_item *item)
 	struct cmd_find_state	*target = cmdq_get_target(item);
 	struct event_payload	*ep;
 	struct cmd_find_state	 fs;
+	struct client		*c = cmdq_get_client(item);
 	struct winlink		*wl = target->wl;
 	struct window		*w = wl->window;
 	struct session		*s = target->s;
-	struct window_pane	*wp = target->wp, *lastwp;
+	struct window_pane	*wp = target->wp, *lastwp, *activewp;
 	struct options		*oo = wp->options;
 	char			*title;
 	const char		*style;
 	struct options_entry	*o;
 	int			 visible, Zflag = args_has(args, 'Z');
 
+	if (args_has(args, 's') || args_has(args, 'S')) {
+		if (c == NULL || c->session == NULL) {
+			cmdq_error(item, "no current client");
+			return (CMD_RETURN_ERROR);
+		}
+		if (args_has(args, 's'))
+			active_set_pane_mode(c, w, ACTIVE_LOCAL);
+		else
+			active_set_pane_mode(c, w, ACTIVE_SHARED);
+		return (CMD_RETURN_NORMAL);
+	}
+
 	if (entry == &cmd_last_pane_entry || args_has(args, 'l')) {
 		/*
 		 * Check for no last pane found in case the other pane was
 		 * spawned without being visited (for example split-window -d).
 		 */
-		lastwp = TAILQ_FIRST(&w->last_panes);
+		lastwp = active_get_last_pane(c, w);
 		if (lastwp == NULL && window_count_panes(w, 1) == 2) {
-			lastwp = TAILQ_PREV(w->active, window_panes, entry);
+			activewp = active_get_effective_pane(c, w);
+			lastwp = TAILQ_PREV(activewp, window_panes, entry);
 			if (lastwp == NULL)
-				lastwp = TAILQ_NEXT(w->active, entry);
+				lastwp = TAILQ_NEXT(activewp, entry);
 		}
 		if (lastwp == NULL) {
 			cmdq_error(item, "no last pane");
@@ -192,8 +209,9 @@ cmd_select_pane_exec(struct cmd *self, struct cmdq_item *item)
 				visible = window_pane_is_visible(lastwp);
 			if (!visible && window_push_zoom(w, 0, Zflag))
 				server_redraw_window(w);
-			window_redraw_active_switch(w, lastwp);
-			if (window_set_active_pane(w, lastwp, 1)) {
+			if (!active_has_local_pane(c, w))
+				window_redraw_active_switch(w, lastwp);
+			if (active_set_pane(c, w, lastwp, 1)) {
 				cmd_find_from_winlink(current, wl, 0);
 				cmd_select_pane_redraw(w);
 			}
@@ -271,7 +289,8 @@ cmd_select_pane_exec(struct cmd *self, struct cmdq_item *item)
 		return (CMD_RETURN_NORMAL);
 	}
 
-	if (wp == w->active)
+	activewp = active_get_effective_pane(c, w);
+	if (wp == activewp)
 		return (CMD_RETURN_NORMAL);
 	if (w->modal != NULL && wp != w->modal)
 		visible = 1;
@@ -279,8 +298,9 @@ cmd_select_pane_exec(struct cmd *self, struct cmdq_item *item)
 		visible = window_pane_is_visible(wp);
 	if (!visible && window_push_zoom(w, 0, Zflag))
 		server_redraw_window(w);
-	window_redraw_active_switch(w, wp);
-	if (window_set_active_pane(w, wp, 1))
+	if (!active_has_local_pane(c, w))
+		window_redraw_active_switch(w, wp);
+	if (active_set_pane(c, w, wp, 1))
 		cmd_find_from_winlink_pane(current, wl, wp, 0);
 	cmdq_insert_hook(s, item, current, "after-select-pane");
 	cmd_select_pane_redraw(w);

cmd-select-window.c

@@ -33,8 +33,8 @@ const struct cmd_entry cmd_select_window_entry = {
 	.name = "select-window",
 	.alias = "selectw",
 
-	.args = { "lnpTt:", 0, 0, NULL },
-	.usage = "[-lnpT] " CMD_TARGET_WINDOW_USAGE,
+	.args = { "LlSnpTt:", 0, 0, NULL },
+	.usage = "[-LlnpST] " CMD_TARGET_WINDOW_USAGE,
 
 	.target = { 't', CMD_FIND_WINDOW, 0 },
 
@@ -88,8 +88,9 @@ cmd_select_window_exec(struct cmd *self, struct cmdq_item *item)
 	struct client		*c = cmdq_get_client(item);
 	struct cmd_find_state	*current = cmdq_get_current(item);
 	struct cmd_find_state	*target = cmdq_get_target(item);
-	struct winlink		*wl = target->wl;
+	struct winlink		*wl = target->wl, *current_wl;
 	struct session		*s = target->s;
+	enum active_mode	 mode;
 	int			 next, previous, last, activity;
 
 	next = (cmd_get_entry(self) == &cmd_next_window_entry);
@@ -102,48 +103,104 @@ cmd_select_window_exec(struct cmd *self, struct cmdq_item *item)
 	if (args_has(args, 'l'))
 		last = 1;
 
+	if (args_has(args, 'L') || args_has(args, 'S')) {
+		if (c == NULL || c->session == NULL) {
+			cmdq_error(item, "no current client");
+			return (CMD_RETURN_ERROR);
+		}
+		if (args_has(args, 'S'))
+			mode = ACTIVE_SHARED;
+		else
+			mode = ACTIVE_LOCAL;
+		active_set_local_window(c, s, mode);
+		if (!next &&
+		    !previous &&
+		    !last &&
+		    !args_has(args, 't') &&
+		    !args_has(args, 'T')) {
+			if (current->s == s) {
+				if (c->session == s)
+					cmd_find_from_client(current, c, 0);
+				else
+					cmd_find_from_session(current, s, 0);
+			}
+			if (c->session == s)
+				server_redraw_client(c);
+			else
+				server_redraw_session(s);
+			cmdq_insert_hook(s, item, current, "after-select-window");
+			recalculate_sizes();
+			return (CMD_RETURN_NORMAL);
+		}
+	}
+
+	if (active_is_local_window(c, s))
+		mode = ACTIVE_LOCAL;
+	else
+		mode = ACTIVE_SHARED;
 	if (next || previous || last) {
 		activity = args_has(args, 'a');
 		if (next) {
-			if (session_next(s, activity) != 0) {
+			if (active_next_window(c, s, activity) != 0) {
 				cmdq_error(item, "no next window");
 				return (CMD_RETURN_ERROR);
 			}
 		} else if (previous) {
-			if (session_previous(s, activity) != 0) {
+			if (active_previous_window(c, s, activity) != 0) {
 				cmdq_error(item, "no previous window");
 				return (CMD_RETURN_ERROR);
 			}
 		} else {
-			if (session_last(s) != 0) {
+			if (active_last_window(c, s) != 0) {
 				cmdq_error(item, "no last window");
 				return (CMD_RETURN_ERROR);
 			}
 		}
-		cmd_find_from_session(current, s, 0);
-		server_redraw_session(s);
+		if (mode == ACTIVE_LOCAL && c != NULL && c->session == s)
+			cmd_find_from_client(current, c, 0);
+		else
+			cmd_find_from_session(current, s, 0);
+		if (mode == ACTIVE_LOCAL && c != NULL && c->session == s)
+			server_redraw_client(c);
+		else
+			server_redraw_session(s);
 		cmdq_insert_hook(s, item, current, "after-select-window");
 	} else {
 		/*
 		 * If -T and select-window is invoked on same window as
 		 * current, switch to previous window.
 		 */
-		if (args_has(args, 'T') && wl == s->curw) {
-			if (session_last(s) != 0) {
+		current_wl = active_get_effective_winlink(c, s);
+		if (args_has(args, 'T') && wl == current_wl) {
+			if (active_last_window(c, s) != 0) {
 				cmdq_error(item, "no last window");
 				return (-1);
 			}
-			if (current->s == s)
+			if (current->s == s) {
+				if (mode == ACTIVE_LOCAL && c != NULL &&
+				    c->session == s)
+					cmd_find_from_client(current, c, 0);
+				else
+					cmd_find_from_session(current, s, 0);
+			}
+			if (mode == ACTIVE_LOCAL && c != NULL && c->session == s)
+				server_redraw_client(c);
+			else
+				server_redraw_session(s);
+		} else if (active_select_window(c, s, wl) == 0) {
+			if (mode == ACTIVE_LOCAL && c != NULL && c->session == s)
+				cmd_find_from_client(current, c, 0);
+			else
 				cmd_find_from_session(current, s, 0);
-			server_redraw_session(s);
-		} else if (session_select(s, wl->idx) == 0) {
-			cmd_find_from_session(current, s, 0);
-			server_redraw_session(s);
+			if (mode == ACTIVE_LOCAL && c != NULL && c->session == s)
+				server_redraw_client(c);
+			else
+				server_redraw_session(s);
 		}
 		cmdq_insert_hook(s, item, current, "after-select-window");
 	}
 	if (c != NULL && c->session != NULL)
-		s->curw->window->latest = c;
+		active_get_effective_window(c, s)->latest = c;
 	recalculate_sizes();
 
 	return (CMD_RETURN_NORMAL);

cmd-swap-window.c

@@ -48,10 +48,14 @@ cmd_swap_window_exec(struct cmd *self, struct cmdq_item *item)
 	struct args		*args = cmd_get_args(self);
 	struct cmd_find_state	*source = cmdq_get_source(item);
 	struct cmd_find_state	*target = cmdq_get_target(item);
+	struct client		*c = cmdq_get_client(item);
+	struct client		*tc = cmdq_get_target_client(item);
+	struct client		*ac;
 	struct session		*src = source->s, *dst = target->s;
 	struct session_group	*sg_src, *sg_dst;
 	struct winlink		*wl_src = source->wl, *wl_dst = target->wl;
 	struct window		*w_src, *w_dst;
+	int			 local_src, local_dst;
 
 	sg_src = session_group_contains(src);
 	sg_dst = session_group_contains(dst);
@@ -79,10 +83,22 @@ cmd_swap_window_exec(struct cmd *self, struct cmdq_item *item)
 
 	if (marked_pane.wl == wl_src)
 		marked_pane.wl = wl_dst;
+	ac = tc;
+	if (ac == NULL)
+		ac = c;
+	local_dst = active_is_local_window(ac, dst);
+	local_src = active_is_local_window(ac, src);
 	if (args_has(args, 'd')) {
-		session_select(dst, wl_dst->idx);
-		if (src != dst)
-			session_select(src, wl_src->idx);
+		if (local_dst)
+			active_select_window(ac, dst, wl_dst);
+		else
+			session_select(dst, wl_dst->idx);
+		if (src != dst) {
+			if (local_src)
+				active_select_window(ac, src, wl_src);
+			else
+				session_select(src, wl_src->idx);
+		}
 	}
 	session_group_synchronize_from(src);
 	server_redraw_session_group(src);

cmd-switch-client.c

@@ -53,11 +53,12 @@ cmd_switch_client_exec(struct cmd *self, struct cmdq_item *item)
 	struct cmd_find_state	 target;
 	const char		*tflag = args_get(args, 't');
 	enum cmd_find_type	 type;
-	int			 flags, visible, Zflag = args_has(args, 'Z');
+	int			 flags, visible, window_target;
+	int			 Zflag = args_has(args, 'Z');
 	struct client		*c = cmdq_get_client(item);
 	struct client		*tc = cmdq_get_target_client(item);
 	struct session		*s;
-	struct winlink		*wl;
+	struct winlink		*wl, *current_wl;
 	struct window		*w;
 	struct window_pane	*wp;
 	const char		*tablename;
@@ -65,8 +66,13 @@ cmd_switch_client_exec(struct cmd *self, struct cmdq_item *item)
 	struct sort_criteria	 sort_crit;
 	uid_t			 uid;
 
-	if (tflag != NULL &&
-	    (tflag[strcspn(tflag, ":.%")] != '\0' || strcmp(tflag, "=") == 0)) {
+	window_target = 0;
+	if (tflag != NULL) {
+		if (tflag[strcspn(tflag, ":.%")] != '\0' ||
+		    strcmp(tflag, "=") == 0)
+			window_target = 1;
+	}
+	if (window_target) {
 		type = CMD_FIND_PANE;
 		flags = 0;
 	} else {
@@ -137,7 +143,8 @@ cmd_switch_client_exec(struct cmd *self, struct cmdq_item *item)
 	} else {
 		if (cmdq_get_client(item) == NULL)
 			return (CMD_RETURN_NORMAL);
-		if (wl != NULL && wp != NULL && wp != wl->window->active) {
+		if (window_target && wl != NULL && wp != NULL &&
+		    wp != wl->window->active) {
 			w = wl->window;
 			if (w->modal != NULL && wp != w->modal)
 				visible = 1;
@@ -150,9 +157,13 @@ cmd_switch_client_exec(struct cmd *self, struct cmdq_item *item)
 			if (!visible && window_pop_zoom(w))
 				server_redraw_window(w);
 		}
-		if (wl != NULL) {
-			session_set_current(s, wl);
-			cmd_find_from_session(current, s, 0);
+		if (window_target && wl != NULL) {
+			active_select_window(tc, s, wl);
+			if (active_is_local_window(tc, s)) {
+				current_wl = active_get_effective_winlink(tc, s);
+				cmd_find_from_winlink(current, current_wl, 0);
+			} else
+				cmd_find_from_session(current, s, 0);
 		}
 	}
 

control-notify.c

@@ -222,6 +222,28 @@ control_client_session_changed_cb(__unused const char *name,
 	}
 }
 
+/* Notify control clients that a client changed its effective window. */
+static void
+control_client_window_changed_cb(__unused const char *name,
+    struct event_payload *ep, __unused void *sink_data)
+{
+	struct client		*cc = event_payload_get_client(ep, "client");
+	struct session		*s = event_payload_get_session(ep, "session");
+	struct window		*w = event_payload_get_window(ep, "window");
+	struct client		*c;
+
+	if (cc == NULL || s == NULL || w == NULL)
+		return;
+
+	TAILQ_FOREACH(c, &clients, entry) {
+		if (!CONTROL_SHOULD_NOTIFY_CLIENT(c))
+			continue;
+
+		control_write(c, "%%client-window-changed %s $%u @%u",
+		    cc->name, s->id, w->id);
+	}
+}
+
 /* Notify control clients that a client detached. */
 static void
 control_client_detached_cb(__unused const char *name, struct event_payload *ep,
@@ -359,6 +381,7 @@ control_build_events(void)
 		{ "window-linked", control_window_linked_cb },
 		{ "window-renamed", control_window_renamed_cb },
 		{ "client-session-changed", control_client_session_changed_cb },
+		{ "client-window-changed", control_client_window_changed_cb },
 		{ "client-detached", control_client_detached_cb },
 		{ "session-renamed", control_session_renamed_cb },
 		{ "session-created", control_session_created_cb },

format.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: format.c,v 1.413 2026/08/24 07:26:43 nicm Exp $ */
+/* $OpenBSD: format.c,v 1.415 2026/08/31 19:34:09 nicm Exp $ */
 
 /*
  * Copyright (c) 2011 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -806,7 +806,7 @@ format_cb_window_active_clients(struct format_tree *ft)
 		if (client_session == NULL)
 			continue;
 
-		if (w == client_session->curw->window)
+		if (w == active_get_effective_window(loop, client_session))
 			n++;
 	}
 
@@ -838,7 +838,7 @@ format_cb_window_active_clients_list(struct format_tree *ft)
 		if (client_session == NULL)
 			continue;
 
-		if (w == client_session->curw->window) {
+		if (w == active_get_effective_window(loop, client_session)) {
 			if (EVBUFFER_LENGTH(buffer) > 0)
 				evbuffer_add(buffer, ",", 1);
 			evbuffer_add_printf(buffer, "%s", loop->name);
@@ -1067,7 +1067,8 @@ format_cb_pane_fg(struct format_tree *ft)
 	if (wp == NULL)
 		return (NULL);
 
-	tty_default_colours(&gc, wp, NULL);
+	tty_default_colours(&gc, wp,
+	    active_get_effective_pane(ft->c, wp->window), NULL);
 	return (xstrdup(colour_tostring(gc.fg)));
 }
 
@@ -1118,7 +1119,8 @@ format_cb_pane_bg(struct format_tree *ft)
 	if (wp == NULL)
 		return (NULL);
 
-	tty_default_colours(&gc, wp, NULL);
+	tty_default_colours(&gc, wp,
+	    active_get_effective_pane(ft->c, wp->window), NULL);
 	return (xstrdup(colour_tostring(gc.bg)));
 }
 
@@ -1887,6 +1889,37 @@ format_cb_cursor_blinking(struct format_tree *ft)
 	return (NULL);
 }
 
+/* Callback for history_added. */
+static void *
+format_cb_history_added(struct format_tree *ft)
+{
+	if (ft->wp != NULL)
+		return (format_printf("%u", ft->wp->base.grid->scroll_added));
+	return (NULL);
+}
+
+/* Callback for history_collected. */
+static void *
+format_cb_history_collected(struct format_tree *ft)
+{
+	struct window_pane	*wp = ft->wp;
+
+	if (wp != NULL)
+		return (format_printf("%u", wp->base.grid->scroll_collected));
+	return (NULL);
+}
+
+/* Callback for history_generation. */
+static void *
+format_cb_history_generation(struct format_tree *ft)
+{
+	struct window_pane	*wp = ft->wp;
+
+	if (wp != NULL)
+		return (format_printf("%u", wp->base.grid->scroll_generation));
+	return (NULL);
+}
+
 /* Callback for history_limit. */
 static void *
 format_cb_history_limit(struct format_tree *ft)
@@ -2159,14 +2192,45 @@ format_cb_pane_private_modes(struct format_tree *ft)
 static void *
 format_cb_pane_active(struct format_tree *ft)
 {
+	struct window_pane	*active;
+
 	if (ft->wp != NULL) {
-		if (ft->wp == ft->wp->window->active)
+		active = active_get_effective_pane(ft->c, ft->wp->window);
+		if (ft->wp == active)
 			return (xstrdup("1"));
 		return (xstrdup("0"));
 	}
 	return (NULL);
 }
 
+/* Callback for pane_local_active. */
+static void *
+format_cb_pane_local_active(struct format_tree *ft)
+{
+	struct window_pane	*active;
+
+	if (ft->wp != NULL && active_has_local_pane(ft->c, ft->wp->window)) {
+		active = active_get_effective_pane(ft->c, ft->wp->window);
+		if (ft->wp == active)
+			return (xstrdup("1"));
+		return (xstrdup("0"));
+	}
+	return (NULL);
+}
+
+/* Callback for pane_local_mode. */
+static void *
+format_cb_pane_local_mode(struct format_tree *ft)
+{
+	struct window	*w = ft->w;
+
+	if (ft->wp != NULL)
+		w = ft->wp->window;
+	if (active_has_local_pane(ft->c, w))
+		return (xstrdup("1"));
+	return (xstrdup("0"));
+}
+
 /* Callback for pane_at_left. */
 static void *
 format_cb_pane_at_left(struct format_tree *ft)
@@ -2276,6 +2340,19 @@ format_cb_pane_last_output_time(struct format_tree *ft)
 	return (NULL);
 }
 
+/* Callback for pane_output_generation. */
+static void *
+format_cb_pane_output_generation(struct format_tree *ft)
+{
+	unsigned long long	 value;
+
+	if (ft->wp != NULL) {
+		value = ft->wp->output_generation;
+		return (format_printf("%llu", value));
+	}
+	return (NULL);
+}
+
 /* Callback for pane_last_prompt_time. */
 static void *
 format_cb_pane_last_prompt_time(struct format_tree *ft)
@@ -2445,7 +2522,7 @@ static void *
 format_cb_pane_last(struct format_tree *ft)
 {
 	if (ft->wp != NULL) {
-		if (ft->wp == TAILQ_FIRST(&ft->wp->window->last_panes))
+		if (ft->wp == active_get_last_pane(ft->c, ft->wp->window))
 			return (xstrdup("1"));
 		return (xstrdup("0"));
 	}
@@ -3022,11 +3099,48 @@ format_cb_sixel_support(__unused struct format_tree *ft)
 static void *
 format_cb_active_window_index(struct format_tree *ft)
 {
-	if (ft->s != NULL)
-		return (format_printf("%u", ft->s->curw->idx));
+	struct winlink	*wl;
+
+	if (ft->s != NULL) {
+		wl = active_get_effective_winlink(ft->c, ft->s);
+		if (wl != NULL)
+			return (format_printf("%u", wl->idx));
+	}
 	return (NULL);
 }
 
+/* Callback for active_window_id. */
+static void *
+format_cb_active_window_id(struct format_tree *ft)
+{
+	struct winlink	*wl;
+
+	if (ft->s != NULL) {
+		wl = active_get_effective_winlink(ft->c, ft->s);
+		if (wl != NULL)
+			return (format_printf("@%u", wl->window->id));
+	}
+	return (NULL);
+}
+
+/* Callback for local_active_window. */
+static void *
+format_cb_local_active_window(struct format_tree *ft)
+{
+	if (ft->c != NULL && ft->s != NULL)
+		return (format_printf("%d", active_is_local_window(ft->c, ft->s)));
+	return (xstrdup("0"));
+}
+
+/* Callback for active_window_mode. */
+static void *
+format_cb_active_window_mode(struct format_tree *ft)
+{
+	if (ft->c != NULL && ft->s != NULL && active_is_local_window(ft->c, ft->s))
+		return (xstrdup("local"));
+	return (xstrdup("shared"));
+}
+
 /* Callback for last_window_index. */
 static void *
 format_cb_last_window_index(struct format_tree *ft)
@@ -3044,8 +3158,11 @@ format_cb_last_window_index(struct format_tree *ft)
 static void *
 format_cb_window_active(struct format_tree *ft)
 {
+	struct winlink	*wl;
+
 	if (ft->wl != NULL) {
-		if (ft->wl == ft->wl->session->curw)
+		wl = active_get_effective_winlink(ft->c, ft->wl->session);
+		if (ft->wl == wl)
 			return (xstrdup("1"));
 		return (xstrdup("0"));
 	}
@@ -3125,7 +3242,7 @@ static void *
 format_cb_window_flags(struct format_tree *ft)
 {
 	if (ft->wl != NULL)
-		return (xstrdup(window_printable_flags(ft->wl, 1)));
+		return (xstrdup(window_printable_flags(ft->c, ft->wl, 1)));
 	return (NULL);
 }
 
@@ -3312,7 +3429,7 @@ static void *
 format_cb_window_raw_flags(struct format_tree *ft)
 {
 	if (ft->wl != NULL)
-		return (xstrdup(window_printable_flags(ft->wl, 0)));
+		return (xstrdup(window_printable_flags(ft->c, ft->wl, 0)));
 	return (NULL);
 }
 
@@ -3522,9 +3639,15 @@ struct format_table_entry {
  * Only variables which are added by the caller go into the tree.
  */
 static const struct format_table_entry format_table[] = {
+	{ "active_window_id", FORMAT_TABLE_STRING,
+	  format_cb_active_window_id
+	},
 	{ "active_window_index", FORMAT_TABLE_STRING,
 	  format_cb_active_window_index
 	},
+	{ "active_window_mode", FORMAT_TABLE_STRING,
+	  format_cb_active_window_mode
+	},
 	{ "alternate_on", FORMAT_TABLE_STRING,
 	  format_cb_alternate_on
 	},
@@ -3663,12 +3786,21 @@ static const struct format_table_entry format_table[] = {
 	{ "cursor_y", FORMAT_TABLE_STRING,
 	  format_cb_cursor_y
 	},
+	{ "history_added", FORMAT_TABLE_STRING,
+	  format_cb_history_added
+	},
 	{ "history_all_bytes", FORMAT_TABLE_STRING,
 	  format_cb_history_all_bytes
 	},
 	{ "history_bytes", FORMAT_TABLE_STRING,
 	  format_cb_history_bytes
 	},
+	{ "history_collected", FORMAT_TABLE_STRING,
+	  format_cb_history_collected
+	},
+	{ "history_generation", FORMAT_TABLE_STRING,
+	  format_cb_history_generation
+	},
 	{ "history_limit", FORMAT_TABLE_STRING,
 	  format_cb_history_limit
 	},
@@ -3693,6 +3825,9 @@ static const struct format_table_entry format_table[] = {
 	{ "last_window_index", FORMAT_TABLE_STRING,
 	  format_cb_last_window_index
 	},
+	{ "local_active_window", FORMAT_TABLE_STRING,
+	  format_cb_local_active_window
+	},
 	{ "mouse_all_flag", FORMAT_TABLE_STRING,
 	  format_cb_mouse_all_flag
 	},
@@ -3837,6 +3972,12 @@ static const struct format_table_entry format_table[] = {
 	{ "pane_left", FORMAT_TABLE_STRING,
 	  format_cb_pane_left
 	},
+	{ "pane_local_active", FORMAT_TABLE_STRING,
+	  format_cb_pane_local_active
+	},
+	{ "pane_local_mode", FORMAT_TABLE_STRING,
+	  format_cb_pane_local_mode
+	},
 	{ "pane_marked", FORMAT_TABLE_STRING,
 	  format_cb_pane_marked
 	},
@@ -3849,6 +3990,9 @@ static const struct format_table_entry format_table[] = {
 	{ "pane_mode", FORMAT_TABLE_STRING,
 	  format_cb_pane_mode
 	},
+	{ "pane_output_generation", FORMAT_TABLE_STRING,
+	  format_cb_pane_output_generation
+	},
 	{ "pane_path", FORMAT_TABLE_STRING,
 	  format_cb_pane_path
 	},
@@ -5239,15 +5383,18 @@ format_add_window_neighbour(struct format_tree *nft, struct winlink *wl,
     struct session *s, const char *prefix)
 {
 	struct options_entry	*o;
+	struct winlink		*current;
 	const char		*oname;
 	char			*key, *prefixed, *oval;
 
+	current = active_get_effective_winlink(nft->c, s);
+
 	xasprintf(&key, "%s_window_index", prefix);
 	format_add(nft, key, "%u", wl->idx);
 	free(key);
 
 	xasprintf(&key, "%s_window_active", prefix);
-	format_add(nft, key, "%d", wl == s->curw);
+	format_add(nft, key, "%d", wl == current);
 	free(key);
 
 	o = options_first(wl->window->options);
@@ -5275,10 +5422,10 @@ format_loop_windows(struct format_expand_state *es, const char *fmt)
 	struct cmdq_item		*item = ft->item;
 	struct format_tree		*nft;
 	struct format_expand_state	 next;
-	char				*all, *active, *use, *expanded, *value;
+	char				*all, *active_fmt, *use, *expanded, *value;
 	struct evbuffer			*buffer;
 	size_t				 size;
-	struct winlink			*wl, **l;
+	struct winlink			*wl, **l, *active_wl;
 	struct window			*w;
 	int				 i, n;
 
@@ -5287,9 +5434,9 @@ format_loop_windows(struct format_expand_state *es, const char *fmt)
 		return (NULL);
 	}
 
-	if (format_choose(es, fmt, &all, &active, 0) != 0) {
+	if (format_choose(es, fmt, &all, &active_fmt, 0) != 0) {
 		all = xstrdup(fmt);
-		active = NULL;
+		active_fmt = NULL;
 	}
 
 	buffer = evbuffer_new();
@@ -5297,12 +5444,13 @@ format_loop_windows(struct format_expand_state *es, const char *fmt)
 		fatalx("out of memory");
 
 	l = sort_get_winlinks_session(s, &n, sc);
+	active_wl = active_get_effective_winlink(ft->c, s);
 	for (i = 0; i < n; i++) {
 		wl = l[i];
 		w = wl->window;
 		format_log(es, "window loop: %u @%u", wl->idx, w->id);
-		if (active != NULL && wl == s->curw)
-			use = active;
+		if (active_fmt != NULL && wl == active_wl)
+			use = active_fmt;
 		else
 			use = all;
 		nft = format_create(c, item, FORMAT_WINDOW|w->id, ft->flags);
@@ -5311,11 +5459,11 @@ format_loop_windows(struct format_expand_state *es, const char *fmt)
 		format_add(nft, "loop_last_flag", "%d", i == n - 1);
 
 		/* Add neighbour window data to the format tree. */
-		if (i > 0 && l[i - 1] == s->curw)
+		if (i > 0 && l[i - 1] == active_wl)
 			format_add(nft, "window_after_active", "1");
 		else
 			format_add(nft, "window_after_active", "0");
-		if (i + 1 < n && l[i + 1] == s->curw)
+		if (i + 1 < n && l[i + 1] == active_wl)
 			format_add(nft, "window_before_active", "1");
 		else
 			format_add(nft, "window_before_active", "0");
@@ -5335,7 +5483,7 @@ format_loop_windows(struct format_expand_state *es, const char *fmt)
 		free(expanded);
 	}
 
-	free(active);
+	free(active_fmt);
 	free(all);
 
 	if ((size = EVBUFFER_LENGTH(buffer)) != 0)
@@ -6923,9 +7071,9 @@ format_defaults(struct format_tree *ft, struct client *c, struct session *s,
 	if (s == NULL && c != NULL)
 		s = c->session;
 	if (wl == NULL && s != NULL)
-		wl = s->curw;
+		wl = active_get_effective_winlink(c, s);
 	if (wp == NULL && wl != NULL)
-		wp = wl->window->active;
+		wp = active_get_effective_pane(c, wl->window);
 
 	if (c != NULL)
 		format_defaults_client(ft, c);

grid.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: grid.c,v 1.156 2026/08/03 12:58:53 nicm Exp $ */
+/* $OpenBSD: grid.c,v 1.158 2026/09/01 12:49:49 nicm Exp $ */
 
 /*
  * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1635,7 +1635,7 @@ grid_wrap_position(struct grid *gd, u_int px, u_int py, u_int *wx, u_int *wy)
 void
 grid_unwrap_position(struct grid *gd, u_int *px, u_int *py, u_int wx, u_int wy)
 {
-	u_int	yy, ay = 0;
+	u_int	yy, ay = 0, ey = gd->hsize + gd->sy - 1;
 
 	for (yy = 0; yy < gd->hsize + gd->sy - 1; yy++) {
 		if (ay == wy)
@@ -1649,7 +1649,7 @@ grid_unwrap_position(struct grid *gd, u_int *px, u_int *py, u_int wx, u_int wy)
 	 * until we find the end or the line now containing wx.
 	 */
 	if (wx == UINT_MAX) {
-		while (gd->linedata[yy].flags & GRID_LINE_WRAPPED)
+		while (yy < ey && gd->linedata[yy].flags & GRID_LINE_WRAPPED)
 			yy++;
 		wx = gd->linedata[yy].cellused;
 	} else {
@@ -1711,21 +1711,29 @@ grid_in_set(struct grid *gd, u_int px, u_int py, const char *set)
 {
 	struct grid_cell	gc, tmp_gc;
 	u_int			pxx;
+	int			has_tab, has_space;
+
+	has_tab = (strchr(set, '\t') != NULL);
+	has_space = (strchr(set, ' ') != NULL);
 
 	grid_get_cell(gd, px, py, &gc);
-	if (strchr(set, '\t')) {
-		if (gc.flags & GRID_FLAG_PADDING) {
-			pxx = px;
-			do
-				grid_get_cell(gd, --pxx, py, &tmp_gc);
-			while (pxx > 0 && tmp_gc.flags & GRID_FLAG_PADDING);
-			if (tmp_gc.flags & GRID_FLAG_TAB)
-				return (tmp_gc.data.width - (px - pxx));
-		} else if (gc.flags & GRID_FLAG_TAB)
-			return (gc.data.width);
-	}
-	if (gc.flags & GRID_FLAG_PADDING)
+	if (gc.flags & GRID_FLAG_PADDING) {
+		if (!has_tab && !has_space)
+			return (0);
+		pxx = px;
+		do
+			grid_get_cell(gd, --pxx, py, &tmp_gc);
+		while (pxx > 0 && tmp_gc.flags & GRID_FLAG_PADDING);
+		if (((has_tab || has_space) &&
+		    (tmp_gc.flags & GRID_FLAG_TAB)) ||
+		    (has_space && utf8_has_whitespace(&tmp_gc.data)))
+			return (tmp_gc.data.width - (px - pxx));
 		return (0);
+	}
+	if ((has_tab || has_space) && (gc.flags & GRID_FLAG_TAB))
+		return (gc.data.width);
+	if (has_space && utf8_has_whitespace(&gc.data))
+		return (gc.data.width == 0 ? 1 : gc.data.width);
 	return (utf8_cstrhas(set, &gc.data));
 }
 

input.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: input.c,v 1.270 2026/08/17 20:04:00 nicm Exp $ */
+/* $OpenBSD: input.c,v 1.271 2026/08/31 19:34:09 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1049,6 +1049,7 @@ input_parse_buffer(struct window_pane *wp, const u_char *buf, size_t len)
 	if (len == 0)
 		return;
 
+	wp->output_generation++;
 	window_update_activity(wp->window);
 	if (~wp->flags & PANE_ACTIVITY) {
 		wp->flags |= PANE_ACTIVITY;
@@ -3077,7 +3078,8 @@ input_osc_10(struct input_ctx *ictx, const char *p)
 			return;
 		c = window_pane_get_fg_control_client(wp);
 		if (c == -1) {
-			tty_default_colours(&defaults, wp, NULL);
+			tty_default_colours(&defaults, wp, wp->window->active,
+			    NULL);
 			if (COLOUR_DEFAULT(defaults.fg))
 				c = window_pane_get_fg(wp);
 			else

key-bindings.c

@@ -31,6 +31,8 @@
 	" 'Rename' 'r' {command-prompt -I '#S' {rename-session -- '%%'}}" \
 	" 'Detach' 'd' {detach-client}" \
 	" ''" \
+	" '#{?local_active_window,Shared Window,Local Window}' 'L' {select-window #{?local_active_window,-S,-L}}" \
+	" ''" \
 	" 'New Session' 's' {new-session}" \
 	" 'New Window' 'w' {new-window}"
 #define DEFAULT_WINDOW_MENU \
@@ -72,6 +74,8 @@
 	" '#{?#{!:#{pane_floating_flag}},Horizontal Split,}' 'h' {split-window -h}" \
 	" '#{?#{!:#{pane_floating_flag}},Vertical Split,}' 'v' {split-window -v}" \
 	" ''" \
+	" '#{?#{>=:#{window_active_clients},2},#{?pane_local_mode,Shared Active Pane,Local Active Pane},}' 'a' {if -F '#{pane_local_mode}' {select-pane -S} {select-pane -s}}" \
+	" ''" \
 	" '#{?#{&&:#{!:#{pane_floating_flag}},#{>:#{window_panes},1}},Swap Up,}' 'u' {swap-pane -U}" \
 	" '#{?#{&&:#{!:#{pane_floating_flag}},#{>:#{window_panes},1}},Swap Down,}' 'd' {swap-pane -D}" \
 	" '#{?pane_marked_set,,-}Swap Marked' 's' {swap-pane}" \
@@ -503,6 +507,7 @@ key_bindings_init(void)
 
 		/* Mouse button 1 down on pane. */
 		"bind -n MouseDown1Pane { select-pane -t=; send -M }",
+		"bind -n M-MouseDown1Pane { move-pane -P front -t= }",
 
 		/* Mouse button 1 drag on pane. */
 		"bind -n MouseDrag1Pane { if -F '#{||:#{pane_in_mode},#{mouse_any_flag}}' { send -M } { copy-mode -M } }",
@@ -524,6 +529,7 @@ key_bindings_init(void)
 
 		/* Mouse button 1 on border. */
 		"bind -n MouseDown1Border { select-pane -M }",
+		"bind -n M-MouseDown1Border { move-pane -P front -t= }",
 
 		/* Mouse button 1 drag on border. */
 		"bind -n MouseDrag1Border { resize-pane -M }",

layout.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: layout.c,v 1.97 2026/08/20 09:19:24 nicm Exp $ */
+/* $OpenBSD: layout.c,v 1.98 2026/08/25 18:38:05 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -539,6 +539,10 @@ layout_resize_check(struct window *w, struct layout_cell *lc,
 
 	status = window_get_pane_status(w);
 
+	/* Floating cells do not take space from the tiled layout. */
+	if (!layout_cell_is_tiled(lc) && !layout_cell_has_tiled_child(lc))
+		return (0);
+
 	if (lc->type == LAYOUT_WINDOWPANE) {
 		/* Space available in this cell only. */
 		if (type == LAYOUT_LEFTRIGHT) {
@@ -568,6 +572,9 @@ layout_resize_check(struct window *w, struct layout_cell *lc,
 		/* Different type: minimum of available space in child cells. */
 		minimum = UINT_MAX;
 		TAILQ_FOREACH(lcchild, &lc->cells, entry) {
+			if (!layout_cell_is_tiled(lcchild) &&
+			    !layout_cell_has_tiled_child(lcchild))
+				continue;
 			available = layout_resize_check(w, lcchild, type);
 			if (available < minimum)
 				minimum = available;
@@ -661,7 +668,7 @@ layout_resize_set_size(struct window *w, struct layout_cell *lc,
 
 /* Find and return the nearest neighbour to a cell in a specific direction. */
 static struct layout_cell *
-layout_cell_get_neighbour_direction(struct layout_cell *lc, int direction)
+layout_cell_get_neighbour_dir(struct layout_cell *lc, int direction)
 {
 	struct layout_cell	*lcn = lc;
 
@@ -695,9 +702,9 @@ layout_cell_get_neighbour(struct layout_cell *lc)
 	if (lc == TAILQ_LAST(&lcparent->cells, layout_cells))
 		direction = !direction;
 
-	lcother = layout_cell_get_neighbour_direction(lc, direction);
+	lcother = layout_cell_get_neighbour_dir(lc, direction);
 	if (lcother == NULL)
-		lcother = layout_cell_get_neighbour_direction(lc, !direction);
+		lcother = layout_cell_get_neighbour_dir(lc, !direction);
 
 	return (lcother);
 }
@@ -860,7 +867,7 @@ layout_resize_pane_to(struct window_pane *wp, enum layout_type type,
 		size = lc->g.sx;
 	else
 		size = lc->g.sy;
-	if (lc == TAILQ_LAST(&lcparent->cells, layout_cells))
+	if (layout_cell_is_last_tiled(lc))
 		change = size - new_size;
 	else
 		change = new_size - size;
@@ -985,11 +992,11 @@ layout_resize_pane(struct window_pane *wp, enum layout_type type, int change,
 	if (lcparent == NULL)
 		return;
 
-	/* If this is the last cell, move back one. */
-	if (lc == TAILQ_LAST(&lcparent->cells, layout_cells)) {
-		do
-			lc = TAILQ_PREV(lc, layout_cells, entry);
-		while (lc->flags & LAYOUT_CELL_FLOATING);
+	/* If this is the last tiled cell, move back one. */
+	if (layout_cell_is_last_tiled(lc)) {
+		lc = layout_cell_get_neighbour_dir(lc, 0);
+		if (lc == NULL)
+			return;
 	}
 
 	layout_resize_layout(wp->window, lc, type, change, opposite);
@@ -1007,22 +1014,22 @@ layout_resize_pane_grow(struct window *w, struct layout_cell *lc,
 	lcadd = lc;
 
 	/* Look towards the tail for a suitable cell for reduction. */
-	lcremove = TAILQ_NEXT(lc, entry);
+	lcremove = layout_cell_get_neighbour_dir(lc, 1);
 	while (lcremove != NULL) {
 		size = layout_resize_check(w, lcremove, type);
 		if (size > 0)
 			break;
-		lcremove = TAILQ_NEXT(lcremove, entry);
+		lcremove = layout_cell_get_neighbour_dir(lcremove, 1);
 	}
 
 	/* If none found, look towards the head. */
 	if (opposite && lcremove == NULL) {
-		lcremove = TAILQ_PREV(lc, layout_cells, entry);
+		lcremove = layout_cell_get_neighbour_dir(lc, 0);
 		while (lcremove != NULL) {
 			size = layout_resize_check(w, lcremove, type);
 			if (size > 0)
 				break;
-			lcremove = TAILQ_PREV(lcremove, layout_cells, entry);
+			lcremove = layout_cell_get_neighbour_dir(lcremove, 0);
 		}
 	}
 	if (lcremove == NULL)
@@ -1050,13 +1057,13 @@ layout_resize_pane_shrink(struct window *w, struct layout_cell *lc,
 		size = layout_resize_check(w, lcremove, type);
 		if (size != 0)
 			break;
-		lcremove = TAILQ_PREV(lcremove, layout_cells, entry);
+		lcremove = layout_cell_get_neighbour_dir(lcremove, 0);
 	} while (lcremove != NULL);
 	if (lcremove == NULL)
 		return (0);
 
 	/* And add onto the next cell (from the original cell). */
-	lcadd = TAILQ_NEXT(lc, entry);
+	lcadd = layout_cell_get_neighbour_dir(lc, 1);
 	if (lcadd == NULL)
 		return (0);
 

menu.c

@@ -586,7 +586,7 @@ menu_display(struct menu *menu, int flags, int starting_choice,
 	struct options		*o;
 
 	if (fs == NULL)
-		w = c->session->curw->window;
+		w = active_get_effective_window(c, c->session);
 	else
 		w = fs->w;
 	o = w->options;

options-table.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: options-table.c,v 1.243 2026/08/25 08:37:08 nicm Exp $ */
+/* $OpenBSD: options-table.c,v 1.244 2026/09/01 12:49:49 nicm Exp $ */
 
 /*
  * Copyright (c) 2011 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1125,7 +1125,8 @@ const struct options_table_entry options_table[] = {
 	{ .name = "status-style",
 	  .type = OPTIONS_TABLE_STRING,
 	  .scope = OPTIONS_TABLE_SESSION,
-	  .default_str = "bg=themegreen,fg=themeblack",
+	  .default_str = "bg=#{?local_active_window,themeblue,themegreen},"
+			 "fg=themeblack",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the status line."
@@ -1250,7 +1251,8 @@ const struct options_table_entry options_table[] = {
 	   * underscore.
 	   */
 	  .default_str = "!\"#$%&'()*+,-./:;<=>?@[\\]^`{|}~",
-	  .text = "Characters considered to separate words."
+	  .text = "Characters considered to separate words; a space matches "
+		  "any character with the Unicode White_Space property."
 	},
 
 	/* Window options. */
@@ -1552,8 +1554,9 @@ const struct options_table_entry options_table[] = {
 	  .scope = OPTIONS_TABLE_WINDOW|OPTIONS_TABLE_PANE,
 	  .default_str = "fg=#{?pane_modal_flag,themeblue,"
 			 "#{?pane_marked,thememagenta,"
+			 "#{?pane_local_active,themecyan,"
 			 "#{?synchronize-panes,themered,"
-			 "#{?pane_in_mode,themeyellow,themegreen}}}}",
+			 "#{?pane_in_mode,themeyellow,themegreen}}}}}",
 	  .flags = OPTIONS_TABLE_IS_STYLE,
 	  .separator = ",",
 	  .text = "Style of the active pane border."
@@ -1981,6 +1984,8 @@ const struct options_table_entry options_table[] = {
 	    "Run when a client is resized."),
 	OPTIONS_TABLE_HOOK("client-session-changed", "",
 	    "Run when a client's attached session is changed."),
+	OPTIONS_TABLE_HOOK("client-window-changed", "",
+	    "Run when a client's effective window is changed."),
 	OPTIONS_TABLE_HOOK("client-light-theme", "",
 	    "Run when a client switches to a light theme."),
 	OPTIONS_TABLE_HOOK("client-dark-theme", "",

popup.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: popup.c,v 1.76 2026/07/14 19:07:03 nicm Exp $ */
+/* $OpenBSD: popup.c,v 1.77 2026/08/28 08:02:16 nicm Exp $ */
 
 /*
  * Copyright (c) 2020 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -79,7 +79,8 @@ popup_free(struct popup_data *pd)
 
 	if (pd->job != NULL)
 		job_free(pd->job);
-	input_free(pd->ictx);
+	if (pd->ictx != NULL)
+		input_free(pd->ictx);
 
 	free(pd->r.ranges);
 	screen_free(&pd->s);
@@ -102,9 +103,9 @@ popup_reapply_styles(struct popup_data *pd)
 
 	if (s == NULL)
 		return;
-	o = s->curw->window->options;
+	o = active_get_effective_window(c, s)->options;
 
-	ft = format_create_defaults(NULL, c, s, s->curw, NULL);
+	ft = format_create_defaults(NULL, c, s, NULL, NULL);
 
 	/* Reapply popup style from options. */
 	memcpy(&pd->defaults, &grid_default_cell, sizeof pd->defaults);
@@ -569,9 +570,9 @@ popup_display(int flags, enum box_lines lines, struct cmdq_item *item, u_int px,
 	struct style		 sytmp;
 
 	if (s != NULL)
-		o = s->curw->window->options;
+		o = active_get_effective_window(c, s)->options;
 	else
-		o = c->session->curw->window->options;
+		o = active_get_effective_window(c, c->session)->options;
 
 	if (lines == BOX_LINES_DEFAULT)
 		lines = options_get_number(o, "popup-border-lines");

regress/active-window.sh

@@ -0,0 +1,151 @@
+#!/bin/sh
+
+PATH=/bin:/usr/bin
+TERM=screen
+LC_ALL=C.UTF-8
+LANG=C.UTF-8
+export TERM LC_ALL LANG
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -LtestA$$ -f/dev/null"
+
+TMPDIR=$(mktemp -d)
+IN1="$TMPDIR/in1"
+IN2="$TMPDIR/in2"
+OUT1="$TMPDIR/out1"
+OUT2="$TMPDIR/out2"
+PID1=
+PID2=
+
+cleanup()
+{
+	[ -n "$PID1" ] && kill "$PID1" 2>/dev/null
+	[ -n "$PID2" ] && kill "$PID2" 2>/dev/null
+	$TMUX kill-server 2>/dev/null
+	rm -rf "$TMPDIR"
+}
+trap cleanup EXIT
+
+fail()
+{
+	echo "$1"
+	echo "client1:"
+	cat "$OUT1" 2>/dev/null
+	echo "client2:"
+	cat "$OUT2" 2>/dev/null
+	exit 1
+}
+
+wait_for()
+{
+	file=$1
+	pattern=$2
+	i=0
+
+	while [ "$i" -lt 60 ]; do
+		if grep -F -- "$pattern" "$file" >/dev/null 2>&1; then
+			return 0
+		fi
+		sleep 0.1
+		i=$((i + 1))
+	done
+	fail "missing '$pattern' in $file"
+}
+
+send1()
+{
+	printf '%s\n' "$*" >&3
+}
+
+send2()
+{
+	printf '%s\n' "$*" >&4
+}
+
+check_server()
+{
+	out=$($TMUX display-message -p -t "$1" "$2")
+	[ "$out" = "$3" ] || fail "expected '$3' for $1 $2, got '$out'"
+}
+
+$TMUX kill-server 2>/dev/null
+$TMUX new-session -d -s aw -x 80 -y 24 -n w0 || exit 1
+$TMUX new-window -d -t aw: -n w1 || exit 1
+$TMUX new-window -d -t aw: -n w2 || exit 1
+$TMUX new-session -d -s aw2 -x 80 -y 24 -n x0 || exit 1
+$TMUX new-window -d -t aw2: -n x1 || exit 1
+
+mkfifo "$IN1" "$IN2" || exit 1
+: >"$OUT1"
+: >"$OUT2"
+$TMUX -C attach-session -t aw <"$IN1" >"$OUT1" 2>&1 &
+PID1=$!
+$TMUX -C attach-session -t aw <"$IN2" >"$OUT2" 2>&1 &
+PID2=$!
+exec 3>"$IN1"
+exec 4>"$IN2"
+
+send1 'display-message -p C1READY'
+send2 'display-message -p C2READY'
+wait_for "$OUT1" C1READY
+wait_for "$OUT2" C2READY
+
+# Default shared selection: client 1 changes session current, client 2 follows.
+send1 'display-message -p "C1A #{active_window_index} #{local_active_window} #{window_index}"'
+wait_for "$OUT1" 'C1A 0 0 0'
+send1 'select-window -t :1'
+wait_for "$OUT2" '%session-window-changed $0 @1'
+send2 'display-message -p "C2A #{active_window_index} #{local_active_window} #{window_index}"'
+wait_for "$OUT2" 'C2A 1 0 1'
+check_server 'aw:' '#{window_index}' '1'
+
+# Local selection changes only client 1 and becomes the default command target.
+send1 'select-window -L'
+send1 'select-window -t :2'
+send1 'display-message -p "C1B #{active_window_index} #{local_active_window} #{window_index}"'
+wait_for "$OUT1" 'C1B 2 1 2'
+send2 'display-message -p "C2B #{active_window_index} #{local_active_window} #{window_index}"'
+wait_for "$OUT2" 'C2B 1 0 1'
+check_server 'aw:' '#{window_index}' '1'
+
+# Local last-window history is independent of the session shared stack.
+send1 'last-window'
+send1 'display-message -p "C1C #{active_window_index} #{window_index}"'
+wait_for "$OUT1" 'C1C 1 1'
+send1 'next-window'
+send1 'display-message -p "C1D #{active_window_index} #{window_index}"'
+wait_for "$OUT1" 'C1D 2 2'
+check_server 'aw:' '#{window_index}' '1'
+
+# Session switches preserve per-session local selections.
+send1 'switch-client -t aw2'
+send1 'select-window -L'
+send1 'select-window -t :1'
+send1 'display-message -p "C1E #{session_name} #{active_window_index} #{local_active_window}"'
+wait_for "$OUT1" 'C1E aw2 1 1'
+send1 'switch-client -t aw'
+send1 'display-message -p "C1F #{session_name} #{active_window_index} #{local_active_window}"'
+wait_for "$OUT1" 'C1F aw 2 1'
+
+# Returning to shared mode immediately follows the session current window.
+send1 'select-window -S'
+send1 'display-message -p "C1G #{active_window_index} #{local_active_window} #{window_index}"'
+wait_for "$OUT1" 'C1G 1 0 1'
+
+# Invalid local windows recover to a valid session window without changing curw.
+send1 'select-window -L'
+send1 'select-window -t :2'
+$TMUX kill-window -t aw:2 || fail 'kill-window failed'
+send1 'display-message -p "C1H #{active_window_index} #{local_active_window} #{window_index}"'
+wait_for "$OUT1" 'C1H 1 1 1'
+check_server 'aw:' '#{window_index}' '1'
+
+# Creating a window without -d in local mode selects it locally only.
+send1 'new-window -n w3'
+send1 'display-message -p "C1I #{local_active_window} #{window_name}"'
+wait_for "$OUT1" 'C1I 1 w3'
+send2 'display-message -p "C2C #{local_active_window} #{window_name}"'
+wait_for "$OUT2" 'C2C 0 w1'
+check_server 'aw:' '#{window_name}' 'w1'
+
+exit 0

regress/buffers.sh

@@ -28,7 +28,7 @@ $TMUX kill-server 2>/dev/null
 
 TMP=$(mktemp)
 TMP2=$(mktemp)
-trap 'rm -f "$TMP" "$TMP2"; $TMUX kill-server 2>/dev/null' 0 1 15
+trap 'rm -f "$TMP" "$TMP2" "$TMP".*; $TMUX kill-server 2>/dev/null' 0 1 15
 
 # check_ok $cmd...
 #
@@ -270,6 +270,27 @@ if [ $? -eq 0 ]; then
 	exit 1
 fi
 
+# A write error after a successful open must be reported to the server.
+dd if=/dev/zero of="$TMP.big" bs=100000 count=1 2>/dev/null
+check_ok load-buffer -b write-error "$TMP.big"
+mkfifo "$TMP.fifo" || exit 1
+dd if="$TMP.fifo" of="$TMP.got" bs=1 count=8 2>/dev/null &
+reader=$!
+exec 3>"$TMP.fifo"
+out=$($TMUX save-buffer -b write-error "$TMP.fifo" 3>&- 2>&1)
+status=$?
+exec 3>&-
+wait "$reader"
+if [ $status -eq 0 ]; then
+	echo "save-buffer after write error succeeded."
+	exit 1
+fi
+if [ "$(wc -c <"$TMP.got")" -ne 8 ]; then
+	echo "save-buffer write error test wrote wrong amount."
+	exit 1
+fi
+check_ok delete-buffer -b write-error
+
 # save-buffer - writes to stdout and load-buffer - reads from stdin.
 out=$($TMUX save-buffer -b sb -)
 if [ "$out" != "data" ]; then

regress/copy-mode-unicode-whitespace.sh

@@ -0,0 +1,163 @@
+#!/bin/sh
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+
+fail()
+{
+	echo "$1"
+	[ -z "$TMUX" ] || $TMUX kill-server 2>/dev/null
+	exit 1
+}
+
+goto_cell()
+{
+	row=$1
+	column=$2
+
+	$TMUX send-keys -X history-top || fail "$mode: history-top failed"
+	$TMUX send-keys -X start-of-line || fail "$mode: start-of-line failed"
+	[ "$row" -eq 0 ] ||
+	    $TMUX send-keys -X -N "$row" cursor-down ||
+	    fail "$mode: cursor-down failed"
+	[ "$column" -eq 0 ] ||
+	    $TMUX send-keys -X -N "$column" cursor-right ||
+	    fail "$mode: cursor-right failed"
+}
+
+check_cursor()
+{
+	expected=$1
+	actual=$($TMUX display-message -p '#{copy_cursor_x},#{copy_cursor_y}')
+	[ "$actual" = "$expected" ] ||
+	    fail "$mode: expected cursor $expected, got $actual"
+}
+
+check_word()
+{
+	row=$1
+	column=$2
+	expected=$3
+
+	goto_cell "$row" "$column"
+	$TMUX set-buffer sentinel || fail "$mode: set-buffer failed"
+	$TMUX send-keys -X select-word || fail "$mode: select-word failed"
+	$TMUX send-keys -X copy-selection || fail "$mode: copy-selection failed"
+	actual=$($TMUX show-buffer 2>/dev/null)
+	[ "$actual" = "$expected" ] ||
+	    fail "$mode: expected word '$expected', got '$actual'"
+}
+
+check_next_word()
+{
+	row=$1
+	expected=$2
+
+	goto_cell "$row" 0
+	$TMUX send-keys -X next-word || fail "$mode: next-word failed"
+	$TMUX set-buffer sentinel || fail "$mode: set-buffer failed"
+	$TMUX send-keys -X select-word || fail "$mode: select-word failed"
+	$TMUX send-keys -X copy-selection || fail "$mode: copy-selection failed"
+	actual=$($TMUX show-buffer 2>/dev/null)
+	[ "$actual" = "$expected" ] ||
+	    fail "$mode: expected next word '$expected', got '$actual'"
+}
+
+for mode in emacs vi; do
+	TMUX="$TEST_TMUX -Lunicode-whitespace-$mode-$$ -f/dev/null"
+	$TMUX kill-server 2>/dev/null
+	$TMUX new-session -d -x16 -y20 \
+	    "printf 'aa bb\naa\tbb\naa\302\240bb\naa\343\200\200bb\naa:bb\naaaaaaaaaaaaaaa\302\240b\nabcdefghijklmnopq\nhardone\nhardtwo\naa\341\232\200bb\naa\342\200\200bb\naa\342\200\250bb\naa\342\200\251bb\naa\342\200\257bb\naa\342\201\237bb\nxa\302\205b c\n'; exec cat" ||
+	    fail "$mode: new-session failed"
+	$TMUX set-option -g window-size manual || fail "$mode: set size failed"
+	$TMUX set-window-option -g mode-keys "$mode" ||
+	    fail "$mode: set mode-keys failed"
+	$TMUX set-window-option -g word-separators "" ||
+	    fail "$mode: clear word-separators failed"
+	$TMUX copy-mode || fail "$mode: copy-mode failed"
+
+	# ASCII space and TAB retain their existing behaviour.
+	goto_cell 0 0
+	$TMUX send-keys -X next-space || fail "$mode: ASCII next-space failed"
+	check_cursor 3,0
+	goto_cell 1 0
+	$TMUX send-keys -X next-space || fail "$mode: TAB next-space failed"
+	check_cursor 8,1
+	$TMUX send-keys -X previous-space ||
+	    fail "$mode: TAB previous-space failed"
+	check_cursor 0,1
+
+	# NBSP is whitespace for selection and word movement.
+	goto_cell 2 0
+	$TMUX send-keys -X next-word || fail "$mode: NBSP next-word failed"
+	check_cursor 3,2
+	$TMUX send-keys -X previous-word ||
+	    fail "$mode: NBSP previous-word failed"
+	check_cursor 0,2
+	check_word 2 0 aa
+	goto_cell 2 0
+	$TMUX send-keys -X next-word-end ||
+	    fail "$mode: NBSP next-word-end failed"
+	if [ "$mode" = emacs ]; then
+		check_cursor 2,2
+	else
+		check_cursor 1,2
+	fi
+
+	# U+3000 is two columns wide; both its leading and padding cells must be
+	# skipped as one whitespace character in either direction.
+	goto_cell 3 0
+	$TMUX send-keys -X next-word || fail "$mode: U+3000 next-word failed"
+	check_cursor 4,3
+	$TMUX send-keys -X previous-word ||
+	    fail "$mode: U+3000 previous-word failed"
+	check_cursor 0,3
+	goto_cell 3 0
+	$TMUX send-keys -X next-space-end ||
+	    fail "$mode: U+3000 next-space-end failed"
+	if [ "$mode" = emacs ]; then
+		check_cursor 2,3
+	else
+		check_cursor 1,3
+	fi
+
+	# Other characters in word-separators remain literal when space enables
+	# Unicode whitespace matching.
+	$TMUX set-window-option -g word-separators ': ' ||
+	    fail "$mode: set custom word-separators failed"
+	goto_cell 4 0
+	$TMUX send-keys -X next-word || fail "$mode: literal next-word failed"
+	check_cursor 2,4
+	$TMUX set-window-option -g word-separators "" ||
+	    fail "$mode: restore word-separators failed"
+
+	# Whitespace in the last column remains a boundary across a soft wrap.
+	goto_cell 5 0
+	$TMUX send-keys -X next-space ||
+	    fail "$mode: wrapped NBSP next-space failed"
+	check_cursor 0,6
+
+	# A word split only by a soft wrap remains one word, while a hard line
+	# boundary still terminates selection.
+	check_word 7 0 abcdefghijklmnopq
+	check_word 9 0 hardone
+
+	# Check the remaining representative White_Space ranges and U+0085
+	# combined into a cell with another character.
+	check_next_word 11 bb
+	check_next_word 12 bb
+	check_next_word 13 bb
+	check_next_word 14 bb
+	check_next_word 15 bb
+	check_next_word 16 bb
+	goto_cell 17 0
+	$TMUX send-keys -X next-word ||
+	    fail "$mode: combined U+0085 next-word failed"
+	check_cursor 2,17
+
+	$TMUX kill-server 2>/dev/null
+done
+
+exit 0

regress/floating-pane-geometry.sh

@@ -199,5 +199,74 @@ must_fail $TMUX resize-pane -t "$id" -x 0
 must_fail $TMUX resize-pane -t "$id" -y 0
 $TMUX kill-pane -t "$id" || exit 1
 
+# --- Tiled pane resize with floating cells in the layout ---
+
+$TMUX set-option -w -u pane-border-lines || exit 1
+base=$($TMUX display-message -p '#{pane_id}')
+
+# A floating cell after the last tiled cell must not become the recipient of a
+# relative or absolute resize. This is the sequence from GitHub issue 5135.
+floating=$($TMUX new-pane -dPF '#{pane_id}' -t "$base" \
+	-x 50% -y 50% -X 50% -Y 50% 'sleep 100') ||
+	fail "new-pane for tiled resize test failed"
+lower=$($TMUX split-window -dPF '#{pane_id}' -t "$base" 'sleep 100') ||
+	fail "split-window for tiled resize test failed"
+
+$TMUX resize-pane -t "$lower" -U 5 || fail "relative tiled resize failed"
+must_equal "$($TMUX display-message -p -t "$base" '#{pane_height}')" 7
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_top}')" 8
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_height}')" 16
+must_equal "$($TMUX display-message -p -t "$floating" '#{pane_top}')" 13
+must_equal "$($TMUX display-message -p -t "$floating" '#{pane_height}')" 10
+
+$TMUX resize-pane -t "$lower" -y 11 || fail "absolute tiled reset failed"
+$TMUX resize-pane -t "$lower" -y 16 || fail "absolute tiled resize failed"
+must_equal "$($TMUX display-message -p -t "$base" '#{pane_height}')" 7
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_top}')" 8
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_height}')" 16
+must_equal "$($TMUX display-message -p -t "$floating" '#{pane_height}')" 10
+
+$TMUX kill-pane -t "$floating" || exit 1
+$TMUX kill-pane -t "$lower" || exit 1
+
+# A floating cell between tiled siblings must be skipped when finding the cell
+# which donates space to a resize.
+lower=$($TMUX split-window -dPF '#{pane_id}' -t "$base" 'sleep 100') ||
+	fail "split-window for middle floating cell test failed"
+floating=$($TMUX new-pane -dPF '#{pane_id}' -t "$base" \
+	-x 20 -y 8 -X 30 -Y 8 'sleep 100') ||
+	fail "new-pane for middle floating cell test failed"
+
+$TMUX resize-pane -t "$base" -D 3 || fail "resize past floating cell failed"
+must_equal "$($TMUX display-message -p -t "$base" '#{pane_height}')" 15
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_top}')" 16
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_height}')" 8
+must_equal "$($TMUX display-message -p -t "$floating" '#{pane_height}')" 6
+
+$TMUX kill-pane -t "$floating" || exit 1
+$TMUX kill-pane -t "$lower" || exit 1
+
+# A small floating child must not limit the available tiled space in a nested
+# layout with a different split direction.
+lower=$($TMUX split-window -dPF '#{pane_id}' -t "$base" 'sleep 100') ||
+	fail "split-window for nested floating cell test failed"
+right=$($TMUX split-window -dhPF '#{pane_id}' -t "$lower" 'sleep 100') ||
+	fail "horizontal split for nested floating cell test failed"
+floating=$($TMUX new-pane -dPF '#{pane_id}' -t "$lower" \
+	-x 20 -y 3 -X 30 -Y 10 'sleep 100') ||
+	fail "new-pane for nested floating cell test failed"
+
+$TMUX resize-pane -t "$base" -D 3 || fail "nested tiled resize failed"
+must_equal "$($TMUX display-message -p -t "$base" '#{pane_height}')" 15
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_top}')" 16
+must_equal "$($TMUX display-message -p -t "$lower" '#{pane_height}')" 8
+must_equal "$($TMUX display-message -p -t "$right" '#{pane_top}')" 16
+must_equal "$($TMUX display-message -p -t "$right" '#{pane_height}')" 8
+must_equal "$($TMUX display-message -p -t "$floating" '#{pane_height}')" 1
+
+$TMUX kill-pane -t "$floating" || exit 1
+$TMUX kill-pane -t "$right" || exit 1
+$TMUX kill-pane -t "$lower" || exit 1
+
 $TMUX kill-server 2>/dev/null
 exit 0

regress/local-pane-selection.sh

@@ -0,0 +1,201 @@
+#!/bin/sh
+
+PATH=/bin:/usr/bin
+TERM=screen
+LANG=C.UTF-8
+LC_ALL=C.UTF-8
+export TERM LANG LC_ALL
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -LtestA$$ -f/dev/null"
+
+TMPDIR=${TMPDIR:-/tmp}/tmux-local-pane.$$
+mkdir -p "$TMPDIR" || exit 1
+IN1="$TMPDIR/in1"
+IN2="$TMPDIR/in2"
+OUT1="$TMPDIR/out1"
+OUT2="$TMPDIR/out2"
+
+cleanup()
+{
+	$TMUX kill-server 2>/dev/null
+	rm -rf "$TMPDIR"
+}
+trap cleanup 0 1 15
+
+fail()
+{
+	echo "$1"
+	exit 1
+}
+
+wait_for()
+{
+	file=$1
+	pattern=$2
+	i=0
+	while [ "$i" -lt 20 ]; do
+		if grep -q "$pattern" "$file"; then
+			return 0
+		fi
+		sleep 1
+		i=$((i + 1))
+	done
+	echo "missing '$pattern' in $file"
+	cat "$file"
+	return 1
+}
+
+send1()
+{
+	printf '%s\n' "$*" >&3
+}
+
+send2()
+{
+	printf '%s\n' "$*" >&4
+}
+
+check_fmt()
+{
+	out=$($TMUX display-message -p -t "$1" "$2" 2>&1)
+	if [ "$out" != "$3" ]; then
+		echo "Format '$2' for '$1' wrong."
+		echo "Expected: '$3'"
+		echo "But got:  '$out'"
+		exit 1
+	fi
+}
+
+$TMUX kill-server 2>/dev/null
+$TMUX new-session -d -s active -x 80 -y 24 || exit 1
+$TMUX split-window -d -h -t active:0 || exit 1
+$TMUX split-window -d -v -t active:0.0 || exit 1
+style=$($TMUX show-options -wgv pane-active-border-style) || exit 1
+case "$style" in
+*pane_local_active*themecyan*) ;;
+*) fail "pane-active-border-style does not include local active colour" ;;
+esac
+
+p0=$($TMUX display-message -p -t active:0.0 '#{pane_id}') || exit 1
+p1=$($TMUX display-message -p -t active:0.1 '#{pane_id}') || exit 1
+p2=$($TMUX display-message -p -t active:0.2 '#{pane_id}') || exit 1
+$TMUX select-pane -t "$p0" || exit 1
+check_fmt active:0 '#{pane_id}' "$p0"
+
+mkfifo "$IN1" "$IN2" || exit 1
+: >"$OUT1"
+: >"$OUT2"
+$TMUX -C attach-session -t active <"$IN1" >"$OUT1" 2>&1 &
+PID1=$!
+exec 3>"$IN1"
+
+send1 'display-message -p C1_READY'
+wait_for "$OUT1" 'C1_READY' || exit 1
+
+# One attached client cannot enter local mode.
+send1 'select-pane -s'
+send1 "select-pane -t $p1"
+send1 'display-message -p "C1_SINGLE:#{pane_id}:#{pane_active}:#{pane_local_active}"'
+wait_for "$OUT1" "C1_SINGLE:$p1:1:" || exit 1
+check_fmt active:0 '#{pane_id}' "$p1"
+send1 "select-pane -t $p0"
+check_fmt active:0 '#{pane_id}' "$p0"
+
+$TMUX -C attach-session -t active <"$IN2" >"$OUT2" 2>&1 &
+PID2=$!
+exec 4>"$IN2"
+
+send2 'display-message -p C2_READY'
+wait_for "$OUT2" 'C2_READY' || exit 1
+
+# Both clients start in shared mode and see the window active pane.
+send1 'display-message -p "C1_START:#{pane_id}:#{pane_active}:#{pane_local_active}"'
+send2 'display-message -p "C2_START:#{pane_id}:#{pane_active}:#{pane_local_active}"'
+wait_for "$OUT1" "C1_START:$p0:1:" || exit 1
+wait_for "$OUT2" "C2_START:$p0:1:" || exit 1
+
+# Client 1 enters local mode and selects a pane without changing shared state.
+send1 'select-pane -s'
+send1 "select-pane -t $p1"
+send1 'display-message -p "C1_LOCAL:#{pane_id}:#{pane_active}:#{pane_local_active}:#{pane_local_mode}"'
+send1 "display-message -p -t $p0 \"C1_LOCAL_INACTIVE:#{pane_id}:#{pane_active}:#{pane_local_active}\""
+wait_for "$OUT1" "C1_LOCAL:$p1:1:1:1" || exit 1
+wait_for "$OUT1" "C1_LOCAL_INACTIVE:$p0:0:0" || exit 1
+check_fmt active:0 '#{pane_id}' "$p0"
+send2 'display-message -p "C2_SHARED:#{pane_id}:#{pane_active}:#{pane_local_active}"'
+wait_for "$OUT2" "C2_SHARED:$p0:1:" || exit 1
+
+# Client 2 can keep an independent local pane in the same window.
+send2 'select-pane -s'
+send2 "select-pane -t $p2"
+send2 'display-message -p "C2_LOCAL:#{pane_id}:#{pane_active}:#{pane_local_active}"'
+wait_for "$OUT2" "C2_LOCAL:$p2:1:1" || exit 1
+send1 'display-message -p "C1_STILL:#{pane_id}:#{pane_active}:#{pane_local_active}"'
+wait_for "$OUT1" "C1_STILL:$p1:1:1" || exit 1
+
+# Local last-pane history is independent of the shared window history.
+send1 "select-pane -t $p2"
+send1 'last-pane'
+send1 'display-message -p "C1_LAST:#{pane_id}:#{pane_last}"'
+wait_for "$OUT1" "C1_LAST:$p1:0" || exit 1
+check_fmt active:0 '#{pane_id}' "$p0"
+
+# Switching back to shared mode immediately follows window->active.
+send1 'select-pane -S'
+send1 'display-message -p "C1_SHARED_AGAIN:#{pane_id}:#{pane_active}"'
+wait_for "$OUT1" "C1_SHARED_AGAIN:$p0:1" || exit 1
+send1 "select-pane -t $p1"
+check_fmt active:0 '#{pane_id}' "$p1"
+send2 'display-message -p "C2_STILL_LOCAL:#{pane_id}:#{pane_active}"'
+wait_for "$OUT2" "C2_STILL_LOCAL:$p2:1" || exit 1
+
+# Local selection survives switching away and back to the window.
+send2 'new-window -n other'
+send2 'previous-window'
+send2 'display-message -p "C2_AFTER_WINDOW_SWITCH:#{pane_id}:#{pane_active}"'
+wait_for "$OUT2" "C2_AFTER_WINDOW_SWITCH:$p2:1" || exit 1
+
+# Removing a locally active pane recovers to the shared active pane.
+$TMUX kill-pane -t "$p2" || exit 1
+send2 'display-message -p "C2_AFTER_KILL:#{pane_id}:#{pane_active}"'
+wait_for "$OUT2" "C2_AFTER_KILL:$p1:1" || exit 1
+
+# Local selection of a floating pane does not raise it unless requested.
+f1=$($TMUX new-pane -dPF '#{pane_id}' -x 20 -y 6 -X 8 -Y 3 \
+    -t active:0 'sleep 100') || exit 1
+f2=$($TMUX new-pane -dPF '#{pane_id}' -x 20 -y 6 -X 12 -Y 5 \
+    -t active:0 'sleep 100') || exit 1
+check_fmt "$f1" '#{pane_z}' 1
+check_fmt "$f2" '#{pane_z}' 0
+send1 'select-pane -s'
+send1 "select-pane -t $f1"
+send1 "display-message -p -t $f1 \"C1_FLOAT_LOCAL:#{pane_id}:#{pane_active}:#{pane_z}\""
+wait_for "$OUT1" "C1_FLOAT_LOCAL:$f1:1:1" || exit 1
+check_fmt "$f1" '#{pane_z}' 1
+send1 "select-pane -M -t $f1"
+send1 "display-message -p -t $f1 \"C1_FLOAT_BORDER:#{pane_id}:#{pane_active}:#{pane_z}\""
+wait_for "$OUT1" "C1_FLOAT_BORDER:$f1:1:1" || exit 1
+check_fmt "$f1" '#{pane_z}' 1
+send1 "move-pane -P front -t $f1"
+send1 "display-message -p -t $f1 \"C1_FLOAT_RAISE:#{pane_z}\""
+wait_for "$OUT1" "C1_FLOAT_RAISE:0" || exit 1
+check_fmt "$f1" '#{pane_z}' 0
+$TMUX kill-pane -t "$f1" || exit 1
+$TMUX kill-pane -t "$f2" || exit 1
+
+# When only one client remains, local mode is cleared.
+send1 'select-pane -s'
+send1 "select-pane -t $p0"
+send1 'display-message -p "C1_LOCAL_BEFORE_DETACH:#{pane_id}:#{pane_local_active}"'
+wait_for "$OUT1" "C1_LOCAL_BEFORE_DETACH:$p0:1" || exit 1
+kill "$PID2" 2>/dev/null
+wait "$PID2" 2>/dev/null
+send1 'display-message -p "C1_AFTER_DETACH:#{pane_id}:#{pane_local_active}"'
+wait_for "$OUT1" "C1_AFTER_DETACH:$p1:" || exit 1
+
+kill "$PID1" 2>/dev/null
+wait "$PID1" 2>/dev/null
+$TMUX display-message -p alive >/dev/null 2>&1 || fail "server died"
+
+exit 0

resize.c

@@ -348,10 +348,10 @@ recalculate_size_skip_client(struct client *loop, __unused int type,
 	 * is not the current window - this is used for aggressive-resize.
 	 * Otherwise skip any session that doesn't contain the window.
 	 */
-	if (loop->session->curw == NULL)
+	if (active_get_effective_window(loop, loop->session) == NULL)
 		return (1);
 	if (current)
-		return (loop->session->curw->window != w);
+		return (active_get_effective_window(loop, loop->session) != w);
 	return (session_has(loop->session, w) == 0);
 }
 

screen-redraw.c

@@ -295,7 +295,7 @@ static void
 redraw_set_context(struct client *c, struct redraw_build_ctx *bctx)
 {
 	struct session	*s = c->session;
-	struct window	*w = s->curw->window;
+	struct window	*w = active_get_effective_window(c, s);
 
 	memset(bctx, 0, sizeof *bctx);
 	bctx->c = c;
@@ -969,7 +969,7 @@ static struct redraw_scene *
 redraw_make_scene(struct client *c)
 {
 	struct session			*s = c->session;
-	struct window			*w = s->curw->window;
+	struct window			*w = active_get_effective_window(c, s);
 	struct redraw_build_ctx		 bctx;
 	struct redraw_scene		*scene;
 	struct redraw_build_cell	*bc, *last;
@@ -1079,7 +1079,7 @@ static struct redraw_scene *
 redraw_get_scene(struct client *c)
 {
 	struct redraw_scene	*scene = c->redraw_scene;
-	struct window		*w = c->session->curw->window;
+	struct window		*w = active_get_effective_window(c, c->session);
 	const char		*reason = NULL;
 	u_int			 ox, oy, sx, sy;
 
@@ -1117,7 +1117,7 @@ redraw_draw_pane_span(struct redraw_draw_ctx *dctx,
 	struct tty_style_ctx	 style_ctx;
 	u_int			 px, py;
 
-	tty_default_colours(&defaults, wp, &style_ctx.dim);
+	tty_default_colours(&defaults, wp, dctx->active, &style_ctx.dim);
 	style_ctx.defaults = &defaults;
 	style_ctx.palette = &wp->palette;
 	style_ctx.hyperlinks = s->hyperlinks;
@@ -1140,7 +1140,7 @@ redraw_get_default_border_style(struct redraw_draw_ctx *dctx,
 	struct grid_cell	*dgc = &dctx->default_gc;
 
 	if (~dctx->flags & REDRAW_DEFAULT_SET) {
-		ft = format_create_defaults(NULL, c, s, s->curw, NULL);
+		ft = format_create_defaults(NULL, c, s, NULL, NULL);
 		memcpy(dgc, &grid_default_cell, sizeof *dgc);
 		style_add(dgc, oo, "pane-border-style", ft);
 		format_free(ft);
@@ -1334,7 +1334,7 @@ redraw_draw_scrollbar_span(struct redraw_draw_ctx *dctx,
 	memcpy(&slgc, &gc, sizeof slgc);
 	slgc.fg = gc.bg;
 	slgc.bg = gc.fg;
-	tty_default_colours(&pad_gc, wp, NULL);
+	tty_default_colours(&pad_gc, wp, dctx->active, NULL);
 
 	sb_w = sb_style->width;
 	sb_pad = sb_style->pad;
@@ -1603,14 +1603,16 @@ redraw_set_draw_context(struct redraw_draw_ctx *dctx,
 	struct session	*s = c->session;
 	struct options	*oo = s->options;
 	struct tty	*tty = &c->tty;
+	struct winlink	*wl;
 	u_int		 lines;
 
 	memset(dctx, 0, sizeof *dctx);
 	dctx->scene = scene;
 
-	if (server_is_marked(s, s->curw, marked_pane.wp))
+	wl = active_get_effective_winlink(c, s);
+	if (server_is_marked(s, wl, marked_pane.wp))
 		dctx->marked = marked_pane.wp;
-	dctx->active = s->curw->window->active;
+	dctx->active = active_get_effective_pane(c, wl->window);
 
 	lines = status_line_size(c);
 	if (options_get_number(oo, "status-position") == 0)
@@ -1683,7 +1685,7 @@ redraw_draw(struct client *c, struct window_pane *wp, int flags)
 {
 	struct redraw_draw_ctx	 dctx;
 	struct session		*s = c->session;
-	struct window		*w = s->curw->window;
+	struct window		*w = active_get_effective_window(c, s);
 	struct tty		*tty = &c->tty;
 	struct screen		*sl;
 	struct redraw_scene	*scene;
@@ -1883,7 +1885,7 @@ redraw_screen(struct client *c)
 			flags |= REDRAW_OVERLAY;
 		if (c->flags & CLIENT_REDRAWMENU)
 			flags |= REDRAW_MENU;
-		if (c->session->curw->window->menu != NULL)
+		if (active_get_effective_window(c, c->session)->menu != NULL)
 			flags |= REDRAW_MENU;
 		if (flags != 0)
 			redraw_draw(c, NULL, flags);
@@ -1895,7 +1897,7 @@ void
 redraw_pane(struct client *c, struct window_pane *wp)
 {
 	redraw_draw(c, wp, REDRAW_PANE|REDRAW_PANE_SCROLLBAR);
-	if (c->session->curw->window->menu != NULL)
+	if (active_get_effective_window(c, c->session)->menu != NULL)
 		redraw_draw(c, NULL, REDRAW_MENU);
 }
 

screen-write.c

@@ -134,7 +134,7 @@ screen_write_redraw_cb(const struct tty_ctx *ttyctx)
 static int
 screen_write_set_client_cb(struct tty_ctx *ttyctx, struct client *c)
 {
-	struct window_pane	*wp = ttyctx->arg;
+	struct window_pane	*wp = ttyctx->arg, *active;
 
 	if (ttyctx->flags & TTY_CTX_INVISIBLE_PANES) {
 		if (session_has(c->session, wp->window))
@@ -142,7 +142,7 @@ screen_write_set_client_cb(struct tty_ctx *ttyctx, struct client *c)
 		return (0);
 	}
 
-	if (c->session->curw->window != wp->window)
+	if (active_get_effective_window(c, c->session) != wp->window)
 		return (0);
 	if (wp->layout_cell == NULL)
 		return (0);
@@ -160,11 +160,14 @@ screen_write_set_client_cb(struct tty_ctx *ttyctx, struct client *c)
 		return (-1);
 	}
 
+	active = active_get_effective_pane(c, wp->window);
 	if (tty_window_offset(&c->tty, &ttyctx->wox, &ttyctx->woy, &ttyctx->wsx,
 	    &ttyctx->wsy))
 		ttyctx->flags |= TTY_CTX_WINDOW_BIGGER;
 	else
 		ttyctx->flags &= ~TTY_CTX_WINDOW_BIGGER;
+	tty_default_colours(&ttyctx->defaults, wp, active,
+	    &ttyctx->style_ctx.dim);
 
 	ttyctx->xoff = ttyctx->rxoff = wp->xoff;
 	ttyctx->yoff = ttyctx->ryoff = wp->yoff;
@@ -296,7 +299,7 @@ screen_write_initctx(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx,
 		ttyctx->redraw_cb = screen_write_redraw_cb;
 		if (ctx->wp != NULL) {
 			tty_default_colours(&ttyctx->defaults, ctx->wp,
-			    &ttyctx->style_ctx.dim);
+			    ctx->wp->window->active, &ttyctx->style_ctx.dim);
 			ttyctx->style_ctx.palette = &ctx->wp->palette;
 			ttyctx->set_client_cb = screen_write_set_client_cb;
 			ttyctx->arg = ctx->wp;

server-client.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: server-client.c,v 1.508 2026/08/25 06:14:16 nicm Exp $ */
+/* $OpenBSD: server-client.c,v 1.509 2026/08/28 07:36:01 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -107,7 +107,7 @@ server_client_set_overlay(struct client *c, u_int delay,
 		c->tty.flags |= TTY_FREEZE;
 	if (c->overlay_mode == NULL)
 		c->tty.flags |= TTY_NOCURSOR;
-	window_update_focus(c->session->curw->window);
+	window_update_focus(active_get_effective_window(c, c->session));
 	server_redraw_client(c);
 }
 
@@ -134,7 +134,7 @@ server_client_clear_overlay(struct client *c)
 
 	c->tty.flags &= ~(TTY_FREEZE|TTY_NOCURSOR);
 	if (c->session != NULL)
-		window_update_focus(c->session->curw->window);
+		window_update_focus(active_get_effective_window(c, c->session));
 	server_redraw_client(c);
 }
 
@@ -379,7 +379,8 @@ server_client_attached_lost(struct client *c)
 		found = NULL;
 		TAILQ_FOREACH(loop, &clients, entry) {
 			s = loop->session;
-			if (loop == c || s == NULL || s->curw->window != w)
+			if (loop == c || s == NULL ||
+			    active_get_effective_window(loop, s) != w)
 				continue;
 			if (found == NULL || timercmp(&loop->activity_time,
 			    &found->activity_time, >))
@@ -460,15 +461,15 @@ server_client_set_session(struct client *c, struct session *s)
 	c->flags |= CLIENT_FOCUSED;
 
 	if (old != NULL && old->curw != NULL)
-		window_update_focus(old->curw->window);
+		window_update_focus(active_get_effective_window(c, old));
 	if (s != NULL) {
-		s->curw->window->latest = c;
+		active_get_effective_window(c, s)->latest = c;
 		recalculate_sizes();
-		window_update_focus(s->curw->window);
+		window_update_focus(active_get_effective_window(c, s));
 		session_update_activity(s, NULL);
 		session_theme_changed(s);
 		gettimeofday(&s->last_attached_time, NULL);
-		s->curw->flags &= ~WINLINK_ALERTFLAGS;
+		active_get_effective_winlink(c, s)->flags &= ~WINLINK_ALERTFLAGS;
 		alerts_check_session(s);
 		tty_update_client_offset(c);
 		status_timer_start(c);
@@ -493,6 +494,7 @@ server_client_lost(struct client *c)
 	server_client_clear_overlay(c);
 	status_prompt_clear(c);
 	status_message_clear(c);
+	active_remove_client(c);
 
 	RB_FOREACH_SAFE(cf, client_files, &c->files, cf1) {
 		cf->error = EINTR;
@@ -506,6 +508,7 @@ server_client_lost(struct client *c)
 		server_client_attached_lost(c);
 		events_fire_client("client-detached", c);
 	}
+	active_check_clients();
 	if (c->name != NULL && (c->flags & (CLIENT_CONTROL|CLIENT_TERMINAL)))
 		events_fire_client("client-closed", c);
 
@@ -684,7 +687,7 @@ server_client_in_scrollbar_area(struct window_pane *wp, int px, int py)
 static void
 server_client_update_scrollbar_hover(struct client *c, int type, int px, int py)
 {
-	struct window		*w = c->session->curw->window;
+	struct window		*w = active_get_effective_window(c, c->session);
 	struct window_pane	*wp;
 
 	if (type != KEYC_TYPE_MOUSEMOVE)
@@ -856,7 +859,7 @@ server_client_check_mouse(struct client *c, struct key_event *event)
 {
 	struct mouse_event		*m = &event->m;
 	struct session			*s = c->session, *fs;
-	struct window			*w = s->curw->window;
+	struct window			*w = active_get_effective_window(c, s);
 	struct winlink			*fwl;
 	struct window_pane		*wp, *fwp, *lwp = NULL;
 	u_int				 x, y, sx, sy, px, py, n, sl_mpos = 0;
@@ -1359,7 +1362,7 @@ server_client_update_latest(struct client *c)
 
 	if (c->session == NULL)
 		return;
-	w = c->session->curw->window;
+	w = active_get_effective_window(c, c->session);
 
 	if (w->latest == c)
 		return;
@@ -1438,7 +1441,7 @@ server_client_key_callback(struct cmdq_item *item, void *data)
 	/* Check the client is good to accept input. */
 	if (s == NULL || (c->flags & CLIENT_UNATTACHEDFLAGS))
 		goto out;
-	wl = s->curw;
+	wl = active_get_effective_winlink(c, s);
 
 	/* Update the activity timer. */
 	memcpy(&c->last_activity_time, &c->activity_time,
@@ -1499,6 +1502,10 @@ server_client_key_callback(struct cmdq_item *item, void *data)
 	    TAILQ_EMPTY(&wp->modes))
 		goto forward_key;
 
+	/* Focus events are not keys and cannot be bound. */
+	if (key == KEYC_FOCUS_IN || key == KEYC_FOCUS_OUT)
+		goto forward_key;
+
 	/*
 	 * Work out the current key table. If the pane is in a mode, use
 	 * the mode table instead of the default key table.
@@ -1693,7 +1700,7 @@ out:
 static int
 server_client_handle_menu_key(struct client *c, struct key_event *event)
 {
-	struct window		*w = c->session->curw->window;
+	struct window		*w = active_get_effective_window(c, c->session);
 	struct key_event	 new_event;
 	struct mouse_event	*m;
 	u_int			 ox, oy, sx, sy;
@@ -1732,6 +1739,7 @@ server_client_handle_key0(struct client *c, struct key_event *event,
 {
 	struct session		*s = c->session;
 	struct cmdq_item	*item;
+	struct window		*w;
 	struct window_pane	*wp;
 
 	/* Check the client is good to accept input. */
@@ -1802,9 +1810,10 @@ server_client_handle_key0(struct client *c, struct key_event *event,
 			}
 		}
 
-		wp = s->curw->window->active;
+		w = active_get_effective_window(c, s);
+		wp = w->active;
 		if (wp == NULL || !window_pane_has_prompt(wp)) {
-			TAILQ_FOREACH(wp, &s->curw->window->panes, entry) {
+			TAILQ_FOREACH(wp, &w->panes, entry) {
 				if (window_pane_has_prompt(wp) &&
 				    window_pane_is_visible(wp))
 					break;
@@ -2146,8 +2155,8 @@ static void
 server_client_reset_state(struct client *c)
 {
 	struct tty		*tty = &c->tty;
-	struct window		*w = c->session->curw->window;
-	struct window_pane	*wp = w->active, *loop;
+	struct window		*w = active_get_effective_window(c, c->session);
+	struct window_pane	*wp, *loop;
 	struct screen		*s = NULL;
 	struct options		*oo = c->session->options;
 	int			 mode = 0, cursor, flags, pane_mode = 0;
@@ -2155,6 +2164,7 @@ server_client_reset_state(struct client *c)
 	u_int			 sb_w;
 	struct visible_ranges	*r;
 
+	wp = active_get_effective_pane(c, w);
 	if (c->flags & (CLIENT_CONTROL|CLIENT_SUSPENDED))
 		return;
 
@@ -2426,7 +2436,7 @@ server_client_redraw_timer(__unused int fd, __unused short events,
 static void
 server_client_check_modes(struct client *c)
 {
-	struct window			*w = c->session->curw->window;
+	struct window			*w;
 	struct window_pane		*wp;
 	struct window_mode_entry	*wme;
 
@@ -2434,6 +2444,7 @@ server_client_check_modes(struct client *c)
 		return;
 	if (~c->flags & CLIENT_REDRAWSTATUS)
 		return;
+	w = active_get_effective_window(c, c->session);
 	TAILQ_FOREACH(wp, &w->panes, entry) {
 		wme = TAILQ_FIRST(&wp->modes);
 		if (wme != NULL && wme->mode->update != NULL)
@@ -2446,7 +2457,7 @@ static int
 server_client_any_pane_redraw(struct client *c)
 {
 	struct session		*s = c->session;
-	struct window		*w = s->curw->window;
+	struct window		*w = active_get_effective_window(c, s);
 	struct window_pane	*wp;
 
 	if (c->flags & CLIENT_REDRAWWINDOW)
@@ -2464,7 +2475,7 @@ server_client_check_redraw(struct client *c)
 {
 	struct session		*s = c->session;
 	struct tty		*tty = &c->tty;
-	struct window		*w = s->curw->window;
+	struct window		*w = active_get_effective_window(c, s);
 	struct window_pane	*wp;
 	int			 needed, tflags, mode = tty->mode;
 	struct timeval		 tv = { .tv_usec = 1000 };
@@ -2603,14 +2614,15 @@ static void
 server_client_set_path(struct client *c)
 {
 	struct session	*s = c->session;
+	struct window	*w = active_get_effective_window(c, s);
 	const char	*path;
 
-	if (s->curw == NULL || s->curw->window->active == NULL)
+	if (w == NULL || w->active == NULL)
 		return;
-	if (s->curw->window->active->base.path == NULL)
+	if (w->active->base.path == NULL)
 		path = "";
 	else
-		path = s->curw->window->active->base.path;
+		path = w->active->base.path;
 	if (c->path == NULL || strcmp(path, c->path) != 0) {
 		free(c->path);
 		c->path = xstrdup(path);
@@ -2623,11 +2635,12 @@ static void
 server_client_set_progress_bar(struct client *c)
 {
 	struct session		*s = c->session;
+	struct window		*w = active_get_effective_window(c, s);
 	struct progress_bar	*pane_pb;
 
-	if (s->curw == NULL || s->curw->window->active == NULL)
+	if (w == NULL || w->active == NULL)
 		return;
-	pane_pb = &s->curw->window->active->base.progress_bar;
+	pane_pb = &w->active->base.progress_bar;
 	if (pane_pb->state == c->progress_bar.state &&
 	    pane_pb->progress == c->progress_bar.progress)
 		return;
@@ -3164,6 +3177,7 @@ server_client_remove_pane(struct window_pane *wp)
 {
 	struct client			*c;
 
+	active_remove_pane(wp);
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->tty.mouse_last_pane == (int)wp->id) {
 			c->tty.mouse_last_pane = -1;
@@ -3179,6 +3193,7 @@ server_client_print(struct client *c, int parse, struct evbuffer *evb)
 {
 	void				*data = EVBUFFER_DATA(evb);
 	size_t				 size = EVBUFFER_LENGTH(evb);
+	struct window			*w;
 	struct window_pane		*wp;
 	struct window_mode_entry	*wme;
 	char				*sanitized, *msg, *line, empty = '\0';
@@ -3217,7 +3232,8 @@ server_client_print(struct client *c, int parse, struct evbuffer *evb)
 		goto out;
 	}
 
-	wp = c->session->curw->window->active;
+	w = active_get_effective_window(c, c->session);
+	wp = active_get_effective_pane(c, w);
 	wme = TAILQ_FIRST(&wp->modes);
 	if (wme == NULL || wme->mode != &window_view_mode)
 		window_pane_set_mode(wp, NULL, &window_view_mode, NULL, NULL,

server-fn.c

@@ -122,8 +122,7 @@ server_redraw_window(struct window *w)
 
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != NULL &&
-		    c->session->curw != NULL &&
-		    c->session->curw->window == w)
+		    active_get_effective_window(c, c->session) == w)
 			server_redraw_client(c);
 	}
 }
@@ -135,8 +134,7 @@ server_redraw_window_menu(struct window *w)
 
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != NULL &&
-		    c->session->curw != NULL &&
-		    c->session->curw->window == w)
+		    active_get_effective_window(c, c->session) == w)
 			c->flags |= CLIENT_REDRAWMENU;
 	}
 }
@@ -148,8 +146,7 @@ server_redraw_window_borders(struct window *w)
 
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != NULL &&
-		    c->session->curw != NULL &&
-		    c->session->curw->window == w)
+		    active_get_effective_window(c, c->session) == w)
 			c->flags |= CLIENT_REDRAWBORDERS;
 	}
 }

session.c

@@ -203,6 +203,7 @@ session_destroy(struct session *s, int notify, const char *from)
 	if (s->curw == NULL)
 		return;
 	s->curw = NULL;
+	active_remove_session(s);
 
 	RB_REMOVE(sessions, &sessions, s);
 	if (notify)

tmux.1

@@ -1,4 +1,4 @@
-.\" $OpenBSD: tmux.1,v 1.1159 2026/08/25 08:37:08 nicm Exp $
+.\" $OpenBSD: tmux.1,v 1.1163 2026/09/01 12:49:49 nicm Exp $
 .\"
 .\" Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 .\"
@@ -14,7 +14,7 @@
 .\" IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 .\" OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: August 25 2026 $
+.Dd $Mdocdate: September 1 2026 $
 .Dt TMUX 1
 .Os
 .Sh NAME
@@ -2208,14 +2208,14 @@ Move to the end of the next word.
 .Xc
 Same as
 .Ic next\-word
-but use a space alone as the word separator.
+but treat all non-whitespace characters as part of a word.
 .It Xo
 .Ic next\-space\-end
 (vi: E)
 .Xc
 Same as
 .Ic next\-word\-end
-but use a space alone as the word separator.
+but treat all non-whitespace characters as part of a word.
 .It Xo
 .Ic other\-end
 (vi: o)
@@ -2289,7 +2289,7 @@ Move to the previous word.
 .Xc
 Same as
 .Ic previous\-word
-but use a space alone as the word separator.
+but treat all non-whitespace characters as part of a word.
 .It Xo
 .Ic rectangle\-on
 .Xc
@@ -2574,8 +2574,8 @@ Word separators can be customized with the
 session option.
 Next word moves to the start of the next word, next word end to the end of the
 next word and previous word to the start of the previous word.
-The three next and previous space keys work similarly but use a space alone as
-the word separator.
+The three next and previous space keys work similarly but treat all
+non-whitespace characters as part of a word.
 Setting
 .Em word\-separators
 to the empty string makes next/previous word equivalent to next/previous space.
@@ -3993,7 +3993,7 @@ applies the last set layout if possible (undoes the most recent layout change).
 spreads the current pane and any panes next to it out evenly.
 .Tg selectp
 .It Xo Ic select\-pane
-.Op Fl DdeLlMmRUZ
+.Op Fl ADdeLlMmRsSUZ
 .Op Fl T Ar title
 .Op Fl t Ar target\-pane
 .Xc
@@ -4001,6 +4001,8 @@ spreads the current pane and any panes next to it out evenly.
 Make pane
 .Ar target\-pane
 the active pane in its window.
+.Fl A
+raises the pane if it is floating.
 If one of
 .Fl D ,
 .Fl L ,
@@ -4015,6 +4017,15 @@ keeps the window zoomed if it was zoomed.
 is the same as using the
 .Ic last\-pane
 command.
+.Fl s
+switches the client to local pane selection for the target window when more
+than one client is attached; the pane currently active for the client is
+retained.
+Local pane selection is disabled automatically when fewer than two clients
+remain attached.
+.Fl S
+switches the client back to shared pane selection for the target window, so the
+window's active pane is used.
 .Fl e
 enables or
 .Fl d
@@ -4038,12 +4049,22 @@ and
 .Ic swap\-window .
 .Tg selectw
 .It Xo Ic select\-window
-.Op Fl lnpT
+.Op Fl LlnpST
 .Op Fl t Ar target\-window
 .Xc
 .D1 Pq alias: Ic selectw
 Select the window at
 .Ar target\-window .
+.Fl L
+makes the attached client use a local current window for the target session.
+Window navigation from that client then changes only that client's effective
+window and leaves the session current window unchanged.
+.Fl S
+returns the client to the shared session current window.
+Without
+.Fl L ,
+the current window is shared by the session and stored in the session.
+.Pp
 .Fl l ,
 .Fl n
 and
@@ -5113,6 +5134,8 @@ Supports
 title setting.
 .It usstyle
 Allows underscore style and colour to be set.
+.It utf8
+Supports UTF\-8 output.
 .El
 .It Ic terminal\-overrides[] Ar string
 Allow terminal descriptions read using
@@ -5647,6 +5670,11 @@ If set to both, a bell and a message are produced.
 Sets the session's conception of what characters are considered word
 separators, for the purposes of the next and previous word commands in
 copy mode.
+A space in
+.Ar string
+matches any character with the Unicode
+.Em White_Space
+property.
 .El
 .Pp
 Available window options are:
@@ -7259,7 +7287,10 @@ shows the four frames in turn, changing every 200 milliseconds.
 The following variables are available, where appropriate:
 .Bl -column "XXXXXXXXXXXXXXXXXXX" "XXXXX"
 .It Sy "Variable name" Ta Sy "Alias" Ta Sy "Replaced with"
-.It Li "active_window_index" Ta "" Ta "Index of active window in session"
+.It Li "active_window_id" Ta "" Ta "ID of effective active window"
+.It Li "active_window_index" Ta "" Ta "Index of effective active window"
+.It Li "local_active_window" Ta "" Ta "1 if client has local window selection"
+.It Li "active_window_mode" Ta "" Ta "Window selection mode, shared or local"
 .It Li "alternate_on" Ta "" Ta "1 if pane is in alternate screen"
 .It Li "alternate_saved_x" Ta "" Ta "Saved cursor X in alternate screen"
 .It Li "alternate_saved_y" Ta "" Ta "Saved cursor Y in alternate screen"
@@ -7316,7 +7347,10 @@ The following variables are available, where appropriate:
 .It Li "cursor_very_visible" Ta "" Ta "1 if the cursor is in very visible mode"
 .It Li "cursor_x" Ta "" Ta "Cursor X position in pane"
 .It Li "cursor_y" Ta "" Ta "Cursor Y position in pane"
+.It Li "history_added" Ta "" Ta "Number of lines scrolled into pane history"
 .It Li "history_bytes" Ta "" Ta "Number of bytes in window history"
+.It Li "history_collected" Ta "" Ta "Number of oldest pane history lines discarded at the history limit"
+.It Li "history_generation" Ta "" Ta "Generation incremented when pane history is cleared or reflowed"
 .It Li "history_limit" Ta "" Ta "Maximum window history lines"
 .It Li "history_size" Ta "" Ta "Size of history in lines"
 .It Li "hook" Ta "" Ta "Name of running hook, if any"
@@ -7410,11 +7444,14 @@ The following variables are available, where appropriate:
 .It Li "pane_last" Ta "" Ta "1 if last pane"
 .It Li "pane_last_output_time" Ta "" Ta "Time pane last produced output"
 .It Li "pane_last_prompt_time" Ta "" Ta "Time most recent OSC 133 prompt began"
+.It Li "pane_local_active" Ta "" Ta "1 if active pane is client-local"
+.It Li "pane_local_mode" Ta "" Ta "1 if client has local pane selection"
 .It Li "pane_left" Ta "" Ta "Left of pane"
 .It Li "pane_marked" Ta "" Ta "1 if this is the marked pane"
 .It Li "pane_marked_set" Ta "" Ta "1 if a marked pane is set"
 .It Li "pane_modal_flag" Ta "" Ta "1 if pane is modal"
 .It Li "pane_mode" Ta "" Ta "Name of pane mode, if any"
+.It Li "pane_output_generation" Ta "" Ta "Generation incremented when pane output is processed"
 .It Li "pane_path" Ta "" Ta "Path of pane (can be set by application)"
 .It Li "pane_pid" Ta "" Ta "PID of first process in pane"
 .It Li "pane_pipe" Ta "" Ta "1 if pane is being piped"
@@ -7492,7 +7529,7 @@ The following variables are available, where appropriate:
 .It Li "uid" Ta "" Ta "Server UID"
 .It Li "user" Ta "" Ta "Server user"
 .It Li "version" Ta "" Ta "Server version"
-.It Li "window_active" Ta "" Ta "1 if window active"
+.It Li "window_active" Ta "" Ta "1 if window is the effective active window"
 .It Li "window_active_clients" Ta "" Ta "Number of clients viewing this window"
 .It Li "window_active_clients_list" Ta "" Ta "List of clients viewing this window"
 .It Li "window_active_sessions" Ta "" Ta "Number of sessions on which this window is active"

tmux.h

@@ -1,4 +1,4 @@
-/* $OpenBSD: tmux.h,v 1.1431 2026/08/25 08:37:08 nicm Exp $ */
+/* $OpenBSD: tmux.h,v 1.1433 2026/09/01 12:49:49 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1357,9 +1357,10 @@ struct window_pane {
 	char		 tty[TTY_NAME_MAX];
 	int		 status;
 	struct timeval	 dead_time;
-	struct cmdq_item *wait_item;	/* new-pane -W: waiting for pane exit */
+	struct cmdq_item *wait_item;
 	struct spawn_editor_state *editor;
 
+	uint64_t	 output_generation;
 	time_t		 last_output_time;
 	time_t		 last_prompt_time;
 	time_t		 cmd_start_time;
@@ -2776,6 +2777,42 @@ void	 events_fire_window(const char *, struct window *);
 void	 events_fire_pane(const char *, struct window_pane *);
 void	 events_fire_winlink(const char *, struct winlink *);
 
+/* active.c */
+enum active_mode {
+	ACTIVE_SHARED,
+	ACTIVE_LOCAL
+};
+int		 active_is_local_window(struct client *, struct session *);
+void		 active_set_local_window(struct client *, struct session *,
+		     enum active_mode);
+struct winlink	*active_get_effective_winlink(struct client *,
+		     struct session *);
+struct window	*active_get_effective_window(struct client *,
+		     struct session *);
+int		 active_select_window(struct client *, struct session *,
+		     struct winlink *);
+int		 active_select_window_index(struct client *, struct session *, int);
+int		 active_next_window(struct client *, struct session *, int);
+int		 active_previous_window(struct client *, struct session *, int);
+int		 active_last_window(struct client *, struct session *);
+void		 active_remove_client(struct client *);
+void		 active_remove_session(struct session *);
+void		 active_remove_window(struct window *);
+int		 active_is_effective_window(struct client *, struct session *,
+		     struct winlink *);
+int		 active_is_last_window(struct client *, struct session *,
+		     struct winlink *);
+int		 active_has_local_pane(struct client *, struct window *);
+void		 active_set_pane_mode(struct client *, struct window *,
+		     enum active_mode);
+struct window_pane *active_get_effective_pane(struct client *,
+		     struct window *);
+struct window_pane *active_get_last_pane(struct client *, struct window *);
+int		 active_set_pane(struct client *, struct window *,
+		     struct window_pane *, int);
+void		 active_check_clients(void);
+void		 active_remove_pane(struct window_pane *);
+
 /* format-draw.c */
 void	 format_draw(struct screen_write_ctx *, const struct grid_cell *,
 	     u_int, const char *, struct style_ranges *, int);
@@ -2998,7 +3035,8 @@ void	tty_cmd_sixelimage(struct tty *, const struct tty_ctx *);
 void	tty_draw_images(struct client *, struct window_pane *);
 #endif
 void	tty_cmd_syncstart(struct tty *, const struct tty_ctx *);
-void	tty_default_colours(struct grid_cell *, struct window_pane *, u_int *);
+void	tty_default_colours(struct grid_cell *, struct window_pane *,
+	    struct window_pane *, u_int *);
 
 /* tty-term.c */
 extern struct tty_terms tty_terms;
@@ -3780,7 +3818,7 @@ int		 window_pane_is_visible(struct window_pane *);
 int		 window_pane_exited(struct window_pane *);
 u_int		 window_pane_search(struct window_pane *, const char *, int,
 		     int);
-const char	*window_printable_flags(struct winlink *, int);
+const char	*window_printable_flags(struct client *, struct winlink *, int);
 const char      *window_pane_printable_flags(struct window_pane *);
 struct window_pane *window_pane_find_up(struct window_pane *);
 struct window_pane *window_pane_find_down(struct window_pane *);
@@ -4106,6 +4144,7 @@ void		 session_update_history(struct session *);
 /* utf8.c */
 enum utf8_state	 utf8_towc (const struct utf8_data *, wchar_t *);
 enum utf8_state	 utf8_fromwc(wchar_t wc, struct utf8_data *);
+int		 utf8_has_whitespace(const struct utf8_data *);
 void		 utf8_update_width_cache(void);
 utf8_char	 utf8_build_one(u_char);
 enum utf8_state	 utf8_from_data(const struct utf8_data *, utf8_char *);

tty-features.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: tty-features.c,v 1.42 2026/08/17 14:47:41 nicm Exp $ */
+/* $OpenBSD: tty-features.c,v 1.43 2026/08/31 12:41:03 kirill Exp $ */
 
 /*
  * Copyright (c) 2020 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -368,6 +368,13 @@ static const struct tty_feature tty_feature_progressbar = {
 	0
 };
 
+/* Terminal supports UTF-8. */
+static const struct tty_feature tty_feature_utf8 = {
+	"utf8",
+	NULL,
+	0
+};
+
 /* Available terminal features. */
 static const struct tty_feature *const tty_features[] = {
 	&tty_feature_256,
@@ -390,7 +397,8 @@ static const struct tty_feature *const tty_features[] = {
 	&tty_feature_strikethrough,
 	&tty_feature_sync,
 	&tty_feature_title,
-	&tty_feature_usstyle
+	&tty_feature_usstyle,
+	&tty_feature_utf8
 };
 
 /* Parse features for client. */
@@ -473,6 +481,9 @@ tty_feature_present(struct tty_term *term, const char *name)
 	u_int				 i;
 	char				*copy;
 
+	if (strcmp(name, "utf8") == 0)
+		return ((term->tty->client->flags & CLIENT_UTF8) != 0);
+
 	for (i = 0; i < nitems(tty_features); i++) {
 		tf = tty_features[i];
 		if (strcmp(tf->name, name) == 0) {
@@ -486,7 +497,8 @@ tty_feature_present(struct tty_term *term, const char *name)
 	 * We don't just have the feature flag set. Check if the capabilities
 	 * supported by the client are actual set instead.
 	 */
-	if (tf == NULL || strcmp(name, "ignorefkeys") == 0)
+	if (tf == NULL || tf->capabilities == NULL ||
+	    strcmp(name, "ignorefkeys") == 0)
 		return (0);
 	if (tf->flags != 0 && (term->flags & tf->flags) != tf->flags)
 		return (0);
@@ -534,6 +546,8 @@ tty_apply_features(struct tty_term *term)
 			}
 		}
 		term->flags |= tf->flags;
+		if (tf == &tty_feature_utf8)
+			c->flags |= CLIENT_UTF8;
 	}
 	if ((term->applied_features|feat) == term->applied_features)
 		return (0);

tty-keys.c

@@ -1020,12 +1020,12 @@ complete_key:
 	/* Check for focus events. */
 	if (key == KEYC_FOCUS_OUT) {
 		c->flags &= ~CLIENT_FOCUSED;
-		window_update_focus(c->session->curw->window);
+		window_update_focus(active_get_effective_window(c, c->session));
 		events_fire_client("client-focus-out", c);
 	} else if (key == KEYC_FOCUS_IN) {
 		c->flags |= CLIENT_FOCUSED;
 		events_fire_client("client-focus-in", c);
-		window_update_focus(c->session->curw->window);
+		window_update_focus(active_get_effective_window(c, c->session));
 	}
 
 	/* Fire the key. */

tty.c

@@ -955,7 +955,7 @@ int
 tty_window_bigger(struct tty *tty)
 {
 	struct client	*c = tty->client;
-	struct window	*w = c->session->curw->window;
+	struct window	*w = active_get_effective_window(c, c->session);
 
 	return (tty->sx < w->sx || tty->sy - status_line_size(c) < w->sy);
 }
@@ -977,10 +977,11 @@ static int
 tty_window_offset1(struct tty *tty, u_int *ox, u_int *oy, u_int *sx, u_int *sy)
 {
 	struct client		*c = tty->client;
-	struct window		*w = c->session->curw->window;
-	struct window_pane	*wp = w->active;
+	struct window		*w = active_get_effective_window(c, c->session);
+	struct window_pane	*wp;
 	u_int			 cx, cy, lines;
 
+	wp = active_get_effective_pane(c, w);
 	lines = status_line_size(c);
 
 	if (tty->sx >= w->sx && tty->sy - lines >= w->sy) {
@@ -1044,8 +1045,7 @@ tty_update_window_offset(struct window *w)
 
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (c->session != NULL &&
-		    c->session->curw != NULL &&
-		    c->session->curw->window == w)
+		    active_get_effective_window(c, c->session) == w)
 			tty_update_client_offset(c);
 	}
 }
@@ -1547,7 +1547,7 @@ tty_set_client_cb(struct tty_ctx *ttyctx, struct client *c)
 {
 	struct window_pane	*wp = ttyctx->arg;
 
-	if (c->session->curw->window != wp->window)
+	if (active_get_effective_window(c, c->session) != wp->window)
 		return (0);
 	if (wp->layout_cell == NULL)
 		return (0);
@@ -3159,23 +3159,24 @@ tty_style_changed(struct window_pane *wp)
 }
 
 void
-tty_default_colours(struct grid_cell *gc, struct window_pane *wp, u_int *dim)
+tty_default_colours(struct grid_cell *gc, struct window_pane *wp,
+    struct window_pane *active, u_int *dim)
 {
 	if (wp->flags & PANE_STYLECHANGED)
 		tty_style_changed (wp);
 
 	memcpy(gc, &grid_default_cell, sizeof *gc);
-	if (wp == wp->window->active && wp->cached_active_gc.fg != 8)
+	if (wp == active && wp->cached_active_gc.fg != 8)
 		gc->fg = wp->cached_active_gc.fg;
 	else
 		gc->fg = wp->cached_gc.fg;
-	if (wp == wp->window->active && wp->cached_active_gc.bg != 8)
+	if (wp == active && wp->cached_active_gc.bg != 8)
 		gc->bg = wp->cached_active_gc.bg;
 	else
 		gc->bg = wp->cached_gc.bg;
 
 	if (dim != NULL) {
-		if (wp == wp->window->active)
+		if (wp == active)
 			*dim = wp->cached_active_dim;
 		else
 			*dim = wp->cached_dim;

utf8.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: utf8.c,v 1.71 2026/05/12 09:37:25 nicm Exp $ */
+/* $OpenBSD: utf8.c,v 1.72 2026/09/01 12:49:49 nicm Exp $ */
 
 /*
  * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -603,6 +603,72 @@ utf8_towc(const struct utf8_data *ud, wchar_t *wc)
 	return (UTF8_DONE);
 }
 
+/* Check for a Unicode whitespace character. */
+int
+utf8_has_whitespace(const struct utf8_data *ud)
+{
+	struct utf8_data tmp;
+	wchar_t		 wc;
+	u_int		 offset = 0, size;
+	u_char		 ch;
+
+	while (offset < ud->size) {
+		ch = ud->data[offset];
+		if (ch < 0x80) {
+			wc = ch;
+			size = 1;
+		} else {
+			if (ch >= 0xc2 && ch <= 0xdf)
+				size = 2;
+			else if (ch >= 0xe0 && ch <= 0xef)
+				size = 3;
+			else if (ch >= 0xf0 && ch <= 0xf4)
+				size = 4;
+			else
+				return (0);
+			if (size > ud->size - offset)
+				return (0);
+
+			memset(&tmp, 0, sizeof tmp);
+			memcpy(tmp.data, ud->data + offset, size);
+			tmp.size = tmp.have = size;
+			if (utf8_towc(&tmp, &wc) != UTF8_DONE)
+				return (0);
+		}
+		offset += size;
+
+		switch (wc) {
+		case 0x0009:
+		case 0x000A:
+		case 0x000B:
+		case 0x000C:
+		case 0x000D:
+		case 0x0020:
+		case 0x0085:
+		case 0x00A0:
+		case 0x1680:
+		case 0x2000:
+		case 0x2001:
+		case 0x2002:
+		case 0x2003:
+		case 0x2004:
+		case 0x2005:
+		case 0x2006:
+		case 0x2007:
+		case 0x2008:
+		case 0x2009:
+		case 0x200A:
+		case 0x2028:
+		case 0x2029:
+		case 0x202F:
+		case 0x205F:
+		case 0x3000:
+			return (1);
+		}
+	}
+	return (0);
+}
+
 /* Convert wide character to UTF-8 character. */
 enum utf8_state
 utf8_fromwc(wchar_t wc, struct utf8_data *ud)

window-border.c

@@ -155,9 +155,14 @@ window_pane_get_border_style(struct window_pane *wp, struct client *c,
 	struct format_tree	*ft;
 	const char		*option;
 	struct grid_cell	*saved;
-	int			*flag;
+	struct window		*w;
+	struct window_pane	*active;
+	int			 local, *flag;
 
-	if (wp == c->session->curw->window->active) {
+	w = active_get_effective_window(c, c->session);
+	active = active_get_effective_pane(c, w);
+	local = (wp == active && active_has_local_pane(c, wp->window));
+	if (wp == active) {
 		flag = &wp->active_border_gc_set;
 		saved = &wp->active_border_gc;
 		option = "pane-active-border-style";
@@ -167,8 +172,15 @@ window_pane_get_border_style(struct window_pane *wp, struct client *c,
 		option = "pane-border-style";
 	}
 
-	if (!*flag) {
+	if (local) {
 		ft = format_create_defaults(NULL, c, s, s->curw, wp);
+		style_apply(gc, wp->options, option, ft);
+		format_free(ft);
+		return;
+	}
+
+	if (!*flag) {
+		ft = format_create_defaults(NULL, c, s, NULL, wp);
 		style_apply(saved, wp->options, option, ft);
 		format_free(ft);
 		*flag = 1;
@@ -197,7 +209,7 @@ window_make_pane_status(struct window_pane *wp, struct client *c, u_int width,
 		return (0);
 
 	ft = format_create(c, NULL, FORMAT_PANE|wp->id, FORMAT_STATUS);
-	format_defaults(ft, c, c->session, c->session->curw, wp);
+	format_defaults(ft, c, c->session, NULL, wp);
 
 	fmt = options_get_string(wp->options, "pane-border-format");
 	expanded = format_expand_time(ft, fmt);

window-client.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: window-client.c,v 1.48 2026/08/05 08:54:56 nicm Exp $ */
+/* $OpenBSD: window-client.c,v 1.49 2026/08/31 12:41:03 kirill Exp $ */
 
 /*
  * Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -102,7 +102,8 @@ static const char *window_client_info_lines[] = {
 	WINDOW_CLIENT_FEATURE(sync) " "
 	WINDOW_CLIENT_FEATURE(title),
 	"              #[#{E:tree-mode-border-style},acs]x#[default] "
-	WINDOW_CLIENT_FEATURE(usstyle),
+	WINDOW_CLIENT_FEATURE(usstyle) " "
+	WINDOW_CLIENT_FEATURE(utf8),
 	"#[#{E:tree-mode-border-style},acs]qqqqqqqqqqqqqqn#{R:q,#{window_width}}#[default]",
 
 	"#[fg=themelightgrey]prefix        #[#{E:tree-mode-border-style},acs]x#[default] "
@@ -268,12 +269,13 @@ window_client_draw_info(__unused void *modedata, void *itemdata,
 	struct window_client_itemdata	*item = itemdata;
 	struct client			*c = item->c;
 	struct screen			*s = ctx->s;
-	struct window			*w = c->session->curw->window;
+	struct window			*w;
 	struct grid_cell		 gc;
 	u_int				 cx = s->cx, cy = s->cy, i;
 	struct format_tree		*ft;
 	char				*expanded;
 
+	w = active_get_effective_window(c, c->session);
 	ft = format_create_defaults(NULL, c, NULL, NULL, NULL);
 	if (c->tty.term->flags & TERM_INVALIDMS)
 		format_add(ft, "clipboard_invalid", "1");

window-copy.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: window-copy.c,v 1.426 2026/08/19 19:55:04 nicm Exp $ */
+/* $OpenBSD: window-copy.c,v 1.429 2026/09/01 13:04:29 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -2207,15 +2207,76 @@ window_copy_cmd_selection_mode(struct window_copy_cmd_state *cs)
 	struct window_mode_entry	*wme = cs->wme;
 	struct options			*so = cs->s->options;
 	struct window_copy_mode_data	*data = wme->data;
+	struct grid_reader		 gr;
 	const char			*s = args_string(cs->wargs, 0);
+	u_int				 sx, sy, ex, ey, fx, fy, x, y;
 
 	if (s == NULL || strcasecmp(s, "char") == 0 || strcasecmp(s, "c") == 0)
 		data->selflag = SEL_CHAR;
 	else if (strcasecmp(s, "word") == 0 || strcasecmp(s, "w") == 0) {
 		data->separators = options_get_string(so, "word-separators");
 		data->selflag = SEL_WORD;
-	} else if (strcasecmp(s, "line") == 0 || strcasecmp(s, "l") == 0)
+	} else if (strcasecmp(s, "line") == 0 || strcasecmp(s, "l") == 0) {
 		data->selflag = SEL_LINE;
+		if (data->screen.sel == NULL)
+			return (WINDOW_COPY_CMD_MOVE);
+
+		/*
+		 * Line selection normally starts with select-line, which sets
+		 * up the reset positions used when the cursor changes
+		 * direction. Do the same when changing an existing selection
+		 * to line mode.
+		 */
+		if (data->cursordrag == CURSORDRAG_SEL) {
+			fx = data->endselx;
+			fy = data->endsely;
+		} else {
+			fx = data->selx;
+			fy = data->sely;
+		}
+
+		sx = data->selx;
+		sy = data->sely;
+		ex = data->endselx;
+		ey = data->endsely;
+		if (ey < sy || (ey == sy && ex < sx)) {
+			x = sx; sx = ex; ex = x;
+			y = sy; sy = ey; ey = y;
+		}
+		grid_reader_start(&gr, data->backing->grid, sx, sy);
+		grid_reader_cursor_start_of_line(&gr, 1);
+		grid_reader_get_cursor(&gr, &sx, &sy);
+		grid_reader_start(&gr, data->backing->grid, ex, ey);
+		grid_reader_cursor_end_of_line(&gr, 1, 0);
+		grid_reader_get_cursor(&gr, &ex, &ey);
+
+		data->rectflag = 0;
+		data->selrx = data->selx = sx;
+		data->selry = data->sely = sy;
+		data->endselrx = data->endselx = ex;
+		data->endselry = data->endsely = ey;
+
+		x = data->cx;
+		y = screen_hsize(data->backing) + data->cy - data->oy;
+		data->dx = fx;
+		data->dy = fy;
+		if (data->cursordrag != CURSORDRAG_NONE &&
+		    (y < fy || (y == fy && x < fx))) {
+			data->lineflag = LINE_SEL_RIGHT_LEFT;
+			data->cursordrag = CURSORDRAG_SEL;
+			window_copy_scroll_to(wme, sx, sy, 1);
+		} else {
+			data->lineflag = LINE_SEL_LEFT_RIGHT;
+			if (data->cursordrag != CURSORDRAG_NONE) {
+				data->cursordrag = CURSORDRAG_ENDSEL;
+				x = window_copy_cursor_limit(wme, ey, 0);
+				window_copy_scroll_to(wme, x, ey, 1);
+			}
+		}
+		if (data->cursordrag == CURSORDRAG_NONE)
+			window_copy_set_selection(wme, 0, 0);
+		return (WINDOW_COPY_CMD_REDRAW);
+	}
 	return (WINDOW_COPY_CMD_MOVE);
 }
 
@@ -4301,7 +4362,7 @@ window_copy_stringify(struct grid *gd, u_int py, u_int first, u_int last,
 		}
 		if (dlen == 1)
 			buf[bx++] = *d;
-		else {
+		else if (dlen != 0) {
 			memcpy(buf + bx, d, dlen);
 			bx += dlen;
 		}
@@ -4851,6 +4912,8 @@ window_copy_search_marks(struct window_mode_entry *wme, struct screen *ssp,
 			cflags |= REG_ICASE;
 		if (regcomp(&reg, sbuf, cflags) != 0) {
 			free(sbuf);
+			free(data->searchmark);
+			data->searchmark = NULL;
 			return (0);
 		}
 		free(sbuf);

window.c

@@ -451,6 +451,7 @@ window_destroy(struct window *w)
 {
 	log_debug("window @%u destroyed (%d references)", w->id, w->references);
 
+	active_remove_window(w);
 	window_unzoom(w, 0);
 	RB_REMOVE(windows, &windows, w);
 
@@ -672,6 +673,7 @@ void
 window_pane_update_focus(struct window_pane *wp)
 {
 	struct client	*c;
+	struct window	*w;
 	int		 focused = 0;
 
 	if (wp != NULL && (~wp->flags & PANE_EXITED)) {
@@ -679,10 +681,12 @@ window_pane_update_focus(struct window_pane *wp)
 			focused = 0;
 		else {
 			TAILQ_FOREACH(c, &clients, entry) {
-				if (c->session != NULL &&
-				    c->session->attached != 0 &&
+				if (c->session == NULL)
+					continue;
+				w = active_get_effective_window(c, c->session);
+				if (c->session->attached != 0 &&
 				    (c->flags & CLIENT_FOCUSED) &&
-				    c->session->curw->window == wp->window &&
+				    w == wp->window &&
 				    c->overlay_draw == NULL &&
 				    wp->window->menu == NULL) {
 					focused = 1;
@@ -788,7 +792,8 @@ window_redraw_active_switch(struct window *w, struct window_pane *wp)
 			break;
 
 		/* If the pane is floating, move to the front. */
-		if (window_pane_is_floating(wp)) {
+		if (window_pane_is_floating(wp) &&
+		    TAILQ_FIRST(&w->z_index) != wp) {
 			TAILQ_REMOVE(&w->z_index, wp, zentry);
 			TAILQ_INSERT_HEAD(&w->z_index, wp, zentry);
 			wp->flags |= PANE_REDRAW;
@@ -1287,7 +1292,7 @@ window_destroy_panes(struct window *w)
 }
 
 const char *
-window_printable_flags(struct winlink *wl, int escape)
+window_printable_flags(struct client *c, struct winlink *wl, int escape)
 {
 	struct session	*s = wl->session;
 	static char	 flags[32];
@@ -1302,9 +1307,9 @@ window_printable_flags(struct winlink *wl, int escape)
 		flags[pos++] = '!';
 	if (wl->flags & WINLINK_SILENCE)
 		flags[pos++] = '~';
-	if (wl == s->curw)
+	if (active_is_effective_window(c, s, wl))
 		flags[pos++] = '*';
-	if (wl == TAILQ_FIRST(&s->lastw))
+	if (active_is_last_window(c, s, wl))
 		flags[pos++] = '-';
 	if (server_check_marked() && wl == marked_pane.wl)
 		flags[pos++] = 'M';
@@ -2634,7 +2639,7 @@ window_pane_get_bg(struct window_pane *wp)
 
 	c = window_pane_get_bg_control_client(wp);
 	if (c == -1) {
-		tty_default_colours(&defaults, wp, NULL);
+		tty_default_colours(&defaults, wp, wp->window->active, NULL);
 		if (COLOUR_DEFAULT(defaults.bg))
 			c = window_get_bg_client(wp);
 		else