vim-patch:8.2.1780: statusline not updated when splitting windows

Problem:    Statusline not updated when splitting windows.
Solution:   Call status_redraw_all(). (Jason Franklin, closes vim/vim#5496)
https://github.com/vim/vim/commit/668008be66326ed9e5b1122abede34ed3d2de2d8

2 files changed, 22 insertions, 5 deletions

diff --git a/src/nvim/testdir/test_statusline.vim b/src/nvim/testdir/test_statusline.vim
index 8c81ec3431..7efd181d04 100644
--- a/src/nvim/testdir/test_statusline.vim
+++ b/src/nvim/testdir/test_statusline.vim
@@ -412,3 +412,22 @@ func Test_statusline_removed_group()
   call StopVimInTerminal(buf)
   call delete('XTest_statusline')
 endfunc
+
+func Test_statusline_after_split_vsplit()
+  only
+
+  " Make the status line of each window show the window number.
+  set ls=2 stl=%{winnr()}
+
+  split | redraw
+  vsplit | redraw
+
+  " The status line of the third window should read '3' here.
+  call assert_equal('3', nr2char(screenchar(&lines - 1, 1)))
+
+  only
+  set ls& stl&
+endfunc
+
+
+" vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/nvim/window.c b/src/nvim/window.c
index 6608deb231..e53570edd8 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -1490,13 +1490,11 @@ int win_split_ins(int size, int flags, win_T *new_wp, int dir)
   if (flags & (WSP_TOP | WSP_BOT))
     (void)win_comp_pos();
 
-  /*
-   * Both windows need redrawing
-   */
+  // Both windows need redrawing.  Update all status lines, in case they
+  // show something related to the window count or position.
   redraw_win_later(wp, NOT_VALID);
-  wp->w_redr_status = TRUE;
   redraw_win_later(oldwin, NOT_VALID);
-  oldwin->w_redr_status = TRUE;
+  status_redraw_all();
 
   if (need_status) {
     msg_row = Rows - 1;