Commit: patch 9.2.0880: scroll: window scrolls when using the autocommand window

patch 9.2.0880: scroll: window scrolls when using the autocommand window

Commit: https://github.com/vim/vim/commit/7fe3ea7658a1f3be4e07dee14041302ca129c8a9
Author: Hirohito Higashi <[email protected]>
Date:   Thu Jul 30 19:28:04 2026 +0000

    patch 9.2.0880: scroll: window scrolls when using the autocommand window
    
    Problem:  The window scrolls when an autocommand window is used while the
              cursor is behind multi-byte characters.
    Solution: Use the byte column instead of the character count when computing
              how many screen lines the text up to the cursor takes.
    
    fixes:  #12085
    closes: #20884
    
    Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
    Signed-off-by: Hirohito Higashi <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index f265b3968..9c8c0f493 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -1,4 +1,4 @@
-*todo.txt*	For Vim version 9.2.  Last change: 2026 Jun 23
+*todo.txt*	For Vim version 9.2.  Last change: 2026 Jul 30
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -40,10 +40,10 @@ Mapping with modifier is not recognized after a partial mapping.  Probably
 because the typeahead was simplified when looking for a matching mapping.
 Need to somehow undo the simplification.  #12002
 
-Windows scroll when using the autocmd window.  #12085
-in restore_snapshot_rec() restore more values from the snapshot, instead of
-calling frame_new_height() and frame_new_width(), especially w_topline and
-w_skipcol.
+Using the autocmd window resets w_skipcol when the cursor is in a long
+wrapped line.  In restore_snapshot_rec() restore more values from the
+snapshot, instead of calling frame_new_height() and frame_new_width(),
+especially w_skipcol.
 
 Check places that source "path/*.vim" to not match other extensions, e.g.
 .vim9, on MS-Windows (short file name match, gets expanded to long file name).
diff --git a/src/misc1.c b/src/misc1.c
index c09ae8127..6ba215500 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -439,7 +439,7 @@ plines_win_nofold(win_T *wp, linenr_T lnum)
 
 /*
  * Like plines_win(), but only reports the number of physical screen lines
- * used from the start of the line to the given column number.
+ * used from the start of the line to the given byte column.
  */
     int
 plines_win_col(win_T *wp, linenr_T lnum, long column)
@@ -465,7 +465,8 @@ plines_win_col(win_T *wp, linenr_T lnum, long column)
     line = ml_get_buf(wp->w_buffer, lnum, FALSE);
 
     init_chartabsize_arg(&cts, wp, lnum, 0, line, line);
-    while (*cts.cts_ptr != NUL && --column >= 0)
+    // "column" is a byte index, advance the pointer until it is reached.
+    while (*cts.cts_ptr != NUL && cts.cts_ptr < line + column)
     {
 	cts.cts_vcol += win_lbr_chartabsize(&cts, NULL, NULL);
 	MB_PTR_ADV(cts.cts_ptr);
diff --git a/src/testdir/test_window_cmd.vim b/src/testdir/test_window_cmd.vim
index bf524030f..701eec65c 100644
--- a/src/testdir/test_window_cmd.vim
+++ b/src/testdir/test_window_cmd.vim
@@ -2034,6 +2034,24 @@ func Test_splitkeep_cmdheight()
   set splitkeep& cmdheight&
 endfunc
 
+func Test_aucmd_win_scroll_multibyte()
+  " Using the autocommand window must not scroll the current window when the
+  " cursor is behind multi-byte characters.
+  set splitkeep=cursor
+  call setline(1, repeat([repeat(nr2char(0x3042), 200)], 20))
+  normal! G0100l
+  redraw
+  let topline = line('w0')
+
+  for i in range(3)
+    call bufload(bufadd(''))
+  endfor
+  call assert_equal(topline, line('w0'))
+
+  %bwipeout!
+  set splitkeep&
+endfunc
+
 func Test_splitkeep_cursor()
   CheckScreendump
   let lines =<< trim END
diff --git a/src/version.c b/src/version.c
index 5bc24b40a..caef0f750 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    880,
 /**/
     879,
 /**/

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