From bdfea2a8919963dfe24052635883f0213cff83e8 Mon Sep 17 00:00:00 2001
From: Christian Clason <c.clason@uni-graz.at>
Date: Wed, 3 Jan 2024 19:09:43 +0100
Subject: vim-patch:9.1.0001: when closing window, wincmd p may fail

Avoid `prevwin == curwin` when closing `curwin`

Problem:  When closing the current window (or when moving it to a tabpage), the
          previous window may refer to the new current window
          (`winnr() == winnr('#')`) if that window is selected as the
          new current window.

Solution: Set `prevwin = NULL` when switching away from an invalid `curwin` and
          the target window was the `prevwin`.
          (Sean Dewar)

related: vim/vim#4537
closes: vim/vim#13762

https://github.com/vim/vim/commit/bf44b69d1f91d9778ae1887128c63d35d9a3d19b

Co-authored-by: Sean Dewar <seandewar@users.noreply.github.com>
---
 test/old/testdir/test_window_cmd.vim | 58 ++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

(limited to 'test')

diff --git a/test/old/testdir/test_window_cmd.vim b/test/old/testdir/test_window_cmd.vim
index 152d1bacc7..da1711a0a1 100644
--- a/test/old/testdir/test_window_cmd.vim
+++ b/test/old/testdir/test_window_cmd.vim
@@ -113,6 +113,64 @@ func Test_window_quit()
   bw Xa Xb
 endfunc
 
+func Test_window_curwin_not_prevwin()
+  botright split
+  call assert_equal(2, winnr())
+  call assert_equal(1, winnr('#'))
+  quit
+  call assert_equal(1, winnr())
+  call assert_equal(0, winnr('#'))
+
+  botright split
+  botright split
+  call assert_equal(3, winnr())
+  call assert_equal(2, winnr('#'))
+  1quit
+  call assert_equal(2, winnr())
+  call assert_equal(1, winnr('#'))
+
+  botright split
+  call assert_equal(1, tabpagenr())
+  call assert_equal(3, winnr())
+  call assert_equal(2, winnr('#'))
+  wincmd T
+  call assert_equal(2, tabpagenr())
+  call assert_equal(1, winnr())
+  call assert_equal(0, winnr('#'))
+  tabfirst
+  call assert_equal(1, tabpagenr())
+  call assert_equal(2, winnr())
+  call assert_equal(0, winnr('#'))
+
+  tabonly
+  botright split
+  wincmd t
+  wincmd p
+  call assert_equal(3, winnr())
+  call assert_equal(1, winnr('#'))
+  quit
+  call assert_equal(2, winnr())
+  call assert_equal(1, winnr('#'))
+
+  botright split
+  wincmd t
+  wincmd p
+  call assert_equal(1, tabpagenr())
+  call assert_equal(3, winnr())
+  call assert_equal(1, winnr('#'))
+  wincmd T
+  call assert_equal(2, tabpagenr())
+  call assert_equal(1, winnr())
+  call assert_equal(0, winnr('#'))
+  tabfirst
+  call assert_equal(1, tabpagenr())
+  call assert_equal(2, winnr())
+  call assert_equal(1, winnr('#'))
+
+  tabonly
+  only
+endfunc
+
 func Test_window_horizontal_split()
   call assert_equal(1, winnr('$'))
   3wincmd s
-- 
cgit