vim-patch:9.1.0167: Changing buffer in another window causes it to show matchparen (#27820)

Problem:  Changing buffer in another window using win_execute() causes
          it to show matchparen (after 9.0.0969).
Solution: Delay highlighting with SafeState in BufWinEnter.
          (zeertzjq)

closes: vim/vim#14177

https://github.com/vim/vim/commit/49ffb6b428e1e053446ec0209558a8f9d0963ae7

1 files changed, 39 insertions, 4 deletions

diff --git a/test/functional/legacy/matchparen_spec.lua b/test/functional/legacy/matchparen_spec.lua
index b03107deb0..137448acbd 100644
--- a/test/functional/legacy/matchparen_spec.lua
+++ b/test/functional/legacy/matchparen_spec.lua
@@ -61,13 +61,15 @@ describe('matchparen', function()
       set hidden
       call setline(1, ['()'])
       normal 0
+
+      func OtherBuffer()
+         enew
+         exe "normal iaa\<Esc>0"
+      endfunc
     ]])
     screen:expect(screen1)
 
-    exec([[
-      enew
-      exe "normal iaa\<Esc>0"
-    ]])
+    exec('call OtherBuffer()')
     screen:expect(screen2)
 
     feed('<C-^>')
@@ -77,6 +79,39 @@ describe('matchparen', function()
     screen:expect(screen2)
   end)
 
+  -- oldtest: Test_matchparen_win_execute()
+  it('matchparen highlight when switching buffer in win_execute()', function()
+    local screen = Screen.new(20, 5)
+    screen:set_default_attr_ids({
+      [1] = { background = Screen.colors.Cyan },
+      [2] = { reverse = true, bold = true },
+      [3] = { reverse = true },
+    })
+    screen:attach()
+
+    exec([[
+      source $VIMRUNTIME/plugin/matchparen.vim
+      let s:win = win_getid()
+      call setline(1, '{}')
+      split
+
+      func SwitchBuf()
+        call win_execute(s:win, 'enew | buffer #')
+      endfunc
+    ]])
+    screen:expect([[
+      {1:^{}}                  |
+      {2:[No Name] [+]       }|
+      {}                  |
+      {3:[No Name] [+]       }|
+                          |
+    ]])
+
+    -- Switching buffer away and back shouldn't change matchparen highlight.
+    exec('call SwitchBuf()')
+    screen:expect_unchanged()
+  end)
+
   -- oldtest: Test_matchparen_pum_clear()
   it('is cleared when completion popup is shown', function()
     local screen = Screen.new(30, 9)