Commit: patch 9.2.0983: 'laststatus' is ignored when creating a full-height vertical split

patch 9.2.0983: 'laststatus' is ignored when creating a full-height vertical split

Commit: https://github.com/vim/vim/commit/9388f50145e159cbb69fe0237b007f22cc9415db
Author: Christian Brabandt <[email protected]>
Date:   Wed Aug 19 20:35:34 2026 +0000

    patch 9.2.0983: 'laststatus' is ignored when creating a full-height vertical split
    
    Problem:  'laststatus' is ignored when creating a full-height vertical
              split.  With 'laststatus' zero, CTRL-W H, CTRL-W L and
              :vertical topleft/botright split all give the new window a
              status line, e.g. with
              "vim --clean -c 'set laststatus=0' -c 'sp|wincmd H'".  Setting
              'laststatus' to zero again makes it disappear.
    Solution: In win_split_ins(), only reserve a status line for the new
              full-height window when 'laststatus' is non-zero.
    
    fixes:  #20999
    closes: #21086
    
    Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/src/testdir/test_statusline.vim b/src/testdir/test_statusline.vim
index 0010bb182..71c703028 100644
--- a/src/testdir/test_statusline.vim
+++ b/src/testdir/test_statusline.vim
@@ -1250,4 +1250,61 @@ func Test_statusline_vsep_borrow_hl_mode_change()
   call StopVimInTerminal(buf)
 endfunc
 
+" Creating a full-height vertical split must not add a status line when
+" 'laststatus' is zero.
+func Test_window_cmd_ls0_splitmove()
+  set laststatus=0
+  let avail = &lines - &cmdheight
+
+  " CTRL-W H and CTRL-W L move a window into a full-height vertical split.
+  for cmd in ['H', 'L']
+    split
+    exe 'wincmd ' .. cmd
+    call assert_equal([0, 0],
+          \ map(range(1, winnr('$')), 'avail - winheight(v:val)'),
+          \ 'wincmd ' .. cmd)
+    only!
+  endfor
+
+  " The same when the full-height vertical split is created directly, which
+  " does not go through win_splitmove().
+  for cmd in ['vert topleft new', 'vert botright new',
+        \ 'topleft vsplit', 'botright vsplit']
+    exe cmd
+    call assert_equal([0, 0],
+          \ map(range(1, winnr('$')), 'avail - winheight(v:val)'), cmd)
+    only!
+  endfor
+
+  " With a horizontal split next to it the new window still spans the full
+  " height; the status line between the stacked windows remains.
+  for cmd in ['split | split | wincmd H', 'split | vert topleft new']
+    exe cmd
+    call assert_equal(0, avail - winheight(1), cmd .. ', left window')
+    call assert_equal(1, avail - winheight(2) - winheight(3),
+          \ cmd .. ', right column')
+    only!
+  endfor
+
+  " The reverse still adds a status line to the upper window.
+  vsplit
+  wincmd K
+  call assert_equal(1, avail - winheight(1) - winheight(2))
+  only!
+
+  " With 'laststatus' set every window does get a status line.
+  for ls in [1, 2]
+    exe 'set laststatus=' .. ls
+    split
+    wincmd H
+    call assert_equal([1, 1],
+          \ map(range(1, winnr('$')), 'avail - winheight(v:val)'),
+          \ 'laststatus=' .. ls)
+    only!
+  endfor
+
+  set laststatus&vim
+  %bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index 28805352f..cf15655d7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    983,
 /**/
     982,
 /**/
diff --git a/src/window.c b/src/window.c
index b2ed04e4d..852a22035 100644
--- a/src/window.c
+++ b/src/window.c
@@ -1378,10 +1378,13 @@ win_split_ins(
 	if (flags & (WSP_TOP | WSP_BOT))
 	{
 	    // set height and row of new window to full height
+	    // no status line when 'laststatus' is zero
+	    int stl_height = p_ls > 0 ? statusline_height(curfrp->fr_win) : 0;
+
 	    wp->w_winrow = tabline_height();
-	    win_new_height(wp, curfrp->fr_height
-		    - statusline_height(curfrp->fr_win) - WINBAR_HEIGHT(wp));
-	    wp->w_status_height = statusline_height(curfrp->fr_win);
+	    win_new_height(wp, curfrp->fr_height - stl_height
+							  - WINBAR_HEIGHT(wp));
+	    wp->w_status_height = stl_height;
 	}
 	else
 	{

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