From fdc8e966a9183c08f2afec0817d03b7417a883b3 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Sun, 4 Jun 2023 10:49:02 +0800
Subject: fix(ui): don't send empty grid_line with redrawdebug=compositor
 (#23899)

---
 test/functional/ui/screen.lua            |  1 +
 test/functional/ui/screen_basic_spec.lua | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

(limited to 'test/functional/ui')

diff --git a/test/functional/ui/screen.lua b/test/functional/ui/screen.lua
index 83424d3bea..2307fd106b 100644
--- a/test/functional/ui/screen.lua
+++ b/test/functional/ui/screen.lua
@@ -947,6 +947,7 @@ end
 
 function Screen:_handle_grid_line(grid, row, col, items)
   assert(self._options.ext_linegrid)
+  assert(#items > 0)
   local line = self._grids[grid].rows[row+1]
   local colpos = col+1
   local hl_id = 0
diff --git a/test/functional/ui/screen_basic_spec.lua b/test/functional/ui/screen_basic_spec.lua
index 67e3b774b4..5d5be2e807 100644
--- a/test/functional/ui/screen_basic_spec.lua
+++ b/test/functional/ui/screen_basic_spec.lua
@@ -1096,3 +1096,18 @@ it('CTRL-F or CTRL-B scrolls a page after UI attach/resize #20605', function()
   feed('<C-F>')
   eq(953, funcs.line('w0'))
 end)
+
+it("showcmd doesn't cause empty grid_line with redrawdebug=compositor #22593", function()
+  clear()
+  local screen = Screen.new(30, 2)
+  screen:set_default_attr_ids({
+    [0] = {bold = true, foreground = Screen.colors.Blue},
+  })
+  screen:attach()
+  command('set showcmd redrawdebug=compositor')
+  feed('d')
+  screen:expect{grid=[[
+    ^                              |
+                       d          |
+  ]]}
+end)
-- 
cgit