Commit: patch 9.2.0874: fold size is compared against 'foldminlines' of the wrong window

patch 9.2.0874: fold size is compared against 'foldminlines' of the wrong window

Commit: https://github.com/vim/vim/commit/773dc19f145744d65e0e920df57e6e3d33fd4591
Author: Igor Mikushkin <[email protected]>
Date:   Wed Jul 29 18:53:08 2026 +0000

    patch 9.2.0874: fold size is compared against 'foldminlines' of the wrong window
    
    Problem:  checkSmall() compares the fold size of window "wp" against
              the current window's 'foldminlines'.  A fold of another
              window, e.g. measured while it is redrawn, is judged by an
              unrelated option value.
    Solution: Use 'foldminlines' of the window containing the fold
              (Igor Mikushkin).
    
    closes: #20864
    
    Co-authored-by: Claude <[email protected]>
    Signed-off-by: Igor Mikushkin <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/src/fold.c b/src/fold.c
index 19c444c14..04698429d 100644
--- a/src/fold.c
+++ b/src/fold.c
@@ -1730,7 +1730,7 @@ checkSmall(
     // Mark any nested folds to maybe-small
     setSmallMaybe(&fp->fd_nested);
 
-    if (fp->fd_len > curwin->w_p_fml)
+    if (fp->fd_len > wp->w_p_fml)
 	fp->fd_small = FALSE;
     else
     {
@@ -1738,7 +1738,7 @@ checkSmall(
 	for (n = 0; n < fp->fd_len; ++n)
 	{
 	    count += plines_win_nofold(wp, fp->fd_top + lnum_off + n);
-	    if (count > curwin->w_p_fml)
+	    if (count > wp->w_p_fml)
 	    {
 		fp->fd_small = FALSE;
 		return;
diff --git a/src/testdir/test_fold.vim b/src/testdir/test_fold.vim
index d4b3a5093..1c09719b1 100644
--- a/src/testdir/test_fold.vim
+++ b/src/testdir/test_fold.vim
@@ -2105,4 +2105,42 @@ func Test_cursor_fold_marker_undo()
   bwipe!
 endfunc
 
+" The fold size must be compared against 'foldminlines' of the window that
+" contains the fold, not of the current window.
+func Test_foldminlines_per_window()
+  " Window with 'foldminlines'=5: its two-line fold stays displayed open.
+  new
+  setlocal foldenable foldmethod=manual foldminlines=5
+  call setline(1, ['one', 'two', 'three', 'four'])
+  2,3fold
+  call assert_equal(-1, foldclosed(2))
+  let winid = win_getid()
+
+  " Split; only the new current window gets 'foldminlines'=0.  setline()
+  " invalidates the fold sizes of both windows and measures them again right
+  " away, the other window's while this window is current.  win_execute()
+  " below only reads that cached verdict, without measuring again.
+  split
+  setlocal foldminlines=0
+  call setline(2, 'changed')
+  call assert_equal(2, foldclosed(2))
+  call win_execute(winid, 'call assert_equal(-1, foldclosed(2))')
+  bwipe!
+
+  " The same the other way around: 'foldminlines'=0 in the other window, so
+  " its fold must remain closed while the current window has a higher value.
+  new
+  setlocal foldenable foldmethod=manual foldminlines=0
+  call setline(1, ['one', 'two', 'three', 'four'])
+  2,3fold
+  call assert_equal(2, foldclosed(2))
+  let winid = win_getid()
+  split
+  setlocal foldminlines=5
+  call setline(2, 'changed')
+  call assert_equal(-1, foldclosed(2))
+  call win_execute(winid, 'call assert_equal(2, foldclosed(2))')
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 1f78ca0d8..9d2474d68 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 */
+/**/
+    874,
 /**/
     873,
 /**/

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