Redraw any visible modes when status line changes so that formats like

the pane title are updated. GitHub issue 2487. Also a man page fix from
jmc.

server-client.c

@@ -42,6 +42,7 @@ static void	server_client_repeat_timer(int, short, void *);
 static void	server_client_click_timer(int, short, void *);
 static void	server_client_check_exit(struct client *);
 static void	server_client_check_redraw(struct client *);
+static void	server_client_check_modes(struct client *);
 static void	server_client_set_title(struct client *);
 static void	server_client_reset_state(struct client *);
 static int	server_client_assume_paste(struct session *);
@@ -1355,6 +1356,7 @@ server_client_loop(void)
 	TAILQ_FOREACH(c, &clients, entry) {
 		server_client_check_exit(c);
 		if (c->session != NULL) {
+			server_client_check_modes(c);
 			server_client_check_redraw(c);
 			server_client_reset_state(c);
 		}
@@ -1810,6 +1812,28 @@ server_client_redraw_timer(__unused int fd, __unused short events,
 	log_debug("redraw timer fired");
 }
 
+/*
+ * Check if modes need to be updated. Only modes in the current window are
+ * updated and it is done when the status line is redrawn.
+ */
+static void
+server_client_check_modes(struct client *c)
+{
+	struct window			*w = c->session->curw->window;
+	struct window_pane		*wp;
+	struct window_mode_entry	*wme;
+
+	if (c->flags & (CLIENT_CONTROL|CLIENT_SUSPENDED))
+		return;
+	if (~c->flags & CLIENT_REDRAWSTATUS)
+		return;
+	TAILQ_FOREACH(wp, &w->panes, entry) {
+		wme = TAILQ_FIRST(&wp->modes);
+		if (wme != NULL && wme->mode->update != NULL)
+			wme->mode->update(wme);
+	}
+}
+
 /* Check for client redraws. */
 static void
 server_client_check_redraw(struct client *c)

tmux.h

@@ -887,6 +887,7 @@ struct window_mode {
 			     struct cmd_find_state *, struct args *);
 	void		 (*free)(struct window_mode_entry *);
 	void		 (*resize)(struct window_mode_entry *, u_int, u_int);
+	void		 (*update)(struct window_mode_entry *);
 	void		 (*key)(struct window_mode_entry *, struct client *,
 			     struct session *, struct winlink *, key_code,
 			     struct mouse_event *);

tty.c

@@ -2447,7 +2447,7 @@ tty_check_fg(struct tty *tty, int *palette, struct grid_cell *gc)
 	/* Is this a 256-colour colour? */
 	if (gc->fg & COLOUR_FLAG_256) {
 		/* And not a 256 colour mode? */
-		if (colours != 256) {
+		if (colours < 256) {
 			gc->fg = colour_256to16(gc->fg);
 			if (gc->fg & 8) {
 				gc->fg &= 7;
@@ -2500,7 +2500,7 @@ tty_check_bg(struct tty *tty, int *palette, struct grid_cell *gc)
 		 * palette. Bold background doesn't exist portably, so just
 		 * discard the bold bit if set.
 		 */
-		if (colours != 256) {
+		if (colours < 256) {
 			gc->bg = colour_256to16(gc->bg);
 			if (gc->bg & 8) {
 				gc->bg &= 7;

window-buffer.c

@@ -31,6 +31,7 @@ static struct screen	*window_buffer_init(struct window_mode_entry *,
 static void		 window_buffer_free(struct window_mode_entry *);
 static void		 window_buffer_resize(struct window_mode_entry *, u_int,
 			     u_int);
+static void		 window_buffer_update(struct window_mode_entry *);
 static void		 window_buffer_key(struct window_mode_entry *,
 			     struct client *, struct session *,
 			     struct winlink *, key_code, struct mouse_event *);
@@ -63,6 +64,7 @@ const struct window_mode window_buffer_mode = {
 	.init = window_buffer_init,
 	.free = window_buffer_free,
 	.resize = window_buffer_resize,
+	.update = window_buffer_update,
 	.key = window_buffer_key,
 };
 
@@ -335,6 +337,16 @@ window_buffer_resize(struct window_mode_entry *wme, u_int sx, u_int sy)
 	mode_tree_resize(data->data, sx, sy);
 }
 
+static void
+window_buffer_update(struct window_mode_entry *wme)
+{
+	struct window_buffer_modedata	*data = wme->data;
+
+	mode_tree_build(data->data);
+	mode_tree_draw(data->data);
+	data->wp->flags |= PANE_REDRAW;
+}
+
 static void
 window_buffer_do_delete(void *modedata, void *itemdata,
     __unused struct client *c, __unused key_code key)

window-client.c

@@ -30,6 +30,7 @@ static struct screen	*window_client_init(struct window_mode_entry *,
 static void		 window_client_free(struct window_mode_entry *);
 static void		 window_client_resize(struct window_mode_entry *, u_int,
 			     u_int);
+static void		 window_client_update(struct window_mode_entry *);
 static void		 window_client_key(struct window_mode_entry *,
 			     struct client *, struct session *,
 			     struct winlink *, key_code, struct mouse_event *);
@@ -59,6 +60,7 @@ const struct window_mode window_client_mode = {
 	.init = window_client_init,
 	.free = window_client_free,
 	.resize = window_client_resize,
+	.update = window_client_update,
 	.key = window_client_key,
 };
 
@@ -311,6 +313,16 @@ window_client_resize(struct window_mode_entry *wme, u_int sx, u_int sy)
 	mode_tree_resize(data->data, sx, sy);
 }
 
+static void
+window_client_update(struct window_mode_entry *wme)
+{
+	struct window_client_modedata	*data = wme->data;
+
+	mode_tree_build(data->data);
+	mode_tree_draw(data->data);
+	data->wp->flags |= PANE_REDRAW;
+}
+
 static void
 window_client_do_detach(void *modedata, void *itemdata,
     __unused struct client *c, key_code key)

window-tree.c

@@ -29,6 +29,7 @@ static struct screen	*window_tree_init(struct window_mode_entry *,
 static void		 window_tree_free(struct window_mode_entry *);
 static void		 window_tree_resize(struct window_mode_entry *, u_int,
 			     u_int);
+static void		 window_tree_update(struct window_mode_entry *);
 static void		 window_tree_key(struct window_mode_entry *,
 			     struct client *, struct session *,
 			     struct winlink *, key_code, struct mouse_event *);
@@ -79,6 +80,7 @@ const struct window_mode window_tree_mode = {
 	.init = window_tree_init,
 	.free = window_tree_free,
 	.resize = window_tree_resize,
+	.update = window_tree_update,
 	.key = window_tree_key,
 };
 
@@ -937,6 +939,16 @@ window_tree_resize(struct window_mode_entry *wme, u_int sx, u_int sy)
 	mode_tree_resize(data->data, sx, sy);
 }
 
+static void
+window_tree_update(struct window_mode_entry *wme)
+{
+	struct window_tree_modedata	*data = wme->data;
+
+	mode_tree_build(data->data);
+	mode_tree_draw(data->data);
+	data->wp->flags |= PANE_REDRAW;
+}
+
 static char *
 window_tree_get_target(struct window_tree_itemdata *item,
     struct cmd_find_state *fs)