From 8b6bdb79e6340b74f2c66c57ebbfac09cafde5c8 Mon Sep 17 00:00:00 2001
From: Ondrej Balaz <blami@blami.net>
Date: Thu, 23 Jul 2026 01:05:37 +0900
Subject: [PATCH] fix(ui): invalid ruler items in other windows #40891

Problem:
When buffer is open in multiple windows and its line count changes, any
'statusline' or 'rulerformat' items depending on it (e.g. %P) will
become invalid in non-current windows because w_redr_status is only set
on first change.

Solution:
Set w_redr_status on all windows with the buffer when the line count
changes.

Signed-off-by: Ondrej Balaz <blami@blami.net>
---
 src/nvim/change.c                        | 14 +++++++++++---
 test/functional/terminal/window_spec.lua |  2 +-
 test/functional/ui/statusline_spec.lua   | 15 +++++++++++++++
 3 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/src/nvim/change.c b/src/nvim/change.c
index 4c9633a938..ff6a25eaa8 100644
--- a/src/nvim/change.c
+++ b/src/nvim/change.c
@@ -243,9 +243,17 @@ static void changed_common(buf_T *buf, linenr_T lnum, colnr_T col, linenr_T lnum
   changed(buf);
 
   FOR_ALL_WINDOWS_IN_TAB(win, curtab) {
-    if (win->w_buffer == buf && win->w_p_diff && diff_internal()) {
-      curtab->tp_diff_update = true;
-      diff_update_line(lnum);
+    if (win->w_buffer == buf) {
+      if (win->w_p_diff && diff_internal()) {
+        curtab->tp_diff_update = true;
+        diff_update_line(lnum);
+      }
+
+      // Redraw status when line count changes to prevent 'statusline' or
+      // 'rulerformat' items becoming invalid.
+      if (xtra != 0) {
+        win->w_redr_status = true;
+      }
     }
   }
 
diff --git a/test/functional/terminal/window_spec.lua b/test/functional/terminal/window_spec.lua
index 74d5b40790..978fd921ce 100644
--- a/test/functional/terminal/window_spec.lua
+++ b/test/functional/terminal/window_spec.lua
@@ -361,7 +361,7 @@ describe(':terminal window', function()
       rows: 5, cols: 25        │rows: 5, cols: 25       |
       ^                         │                        |
                                │                        |*2
-      {120:<o [-] 3,0-1          All }{119:< [-] 2,0-1          Top}|
+      {120:<o [-] 3,0-1          All }{119:< [-] 2,0-1          All}|
       {5:-- TERMINAL --}                                    |
     ]])
     command("call win_execute(win_getid(winnr('#')), 'call cursor(1, 1)')")
diff --git a/test/functional/ui/statusline_spec.lua b/test/functional/ui/statusline_spec.lua
index 6d5e12625b..91b8e37897 100644
--- a/test/functional/ui/statusline_spec.lua
+++ b/test/functional/ui/statusline_spec.lua
@@ -1100,6 +1100,21 @@ describe('statusline', function()
     eq(true, #contexts > 0)
     eq(caller_win, contexts[#contexts].actual)
   end)
+
+  it('%P %L updates in other windows', function()
+    screen:try_resize(40, 14)
+    command('set laststatus=2 statusline=%P\\ %L | split')
+    feed(':put=range(10)<cr>dgg')
+    screen:expect([[
+      ^                                        |
+      {1:~                                       }|*5
+      {3:All 1                                   }|
+                                              |
+      {1:~                                       }|*4
+      {2:All 1                                   }|
+      --No lines in buffer--                  |
+    ]])
+  end)
 end)
 
 describe('default statusline', function()