commit d392a74c5a8af8271a33a20d37ae1a8ea422cb4b
author zeertzjq <zeertzjq@outlook.com> Sat Jul 01 20:24:40 2023 +0100
committer Bram Moolenaar <Bram@vim.org> Sat Jul 01 20:24:40 2023 +0100
tree c8b7a49ba8eef130f6a3af8e66f3d821f58c63b3
parent e7d9ca2b3bf99b0b759be8952e02c77110a354c1

patch 9.0.1672: tabline highlight wrong after truncated double width label

Problem:    Tabline highlight wrong after truncated double width label.
Solution:   Fill up half a double width character later. (closes #12614)

src/testdir/test_tabline.vim

diff --git a/src/testdir/test_tabline.vim b/src/testdir/test_tabline.vim
index 09adf2f..3cba2aa 100644
--- a/src/testdir/test_tabline.vim
+++ b/src/testdir/test_tabline.vim
@@ -133,7 +133,7 @@
   tabnew
   redraw!
 
-  tabclose
+  bw!
   set tabline=
 endfunc
 
@@ -202,4 +202,28 @@
   call StopVimInTerminal(buf)
 endfunc
 
+func TruncTabLine()
+  return '%1T口口%2Ta' .. repeat('b', &columns - 4) .. '%999X%#TabLine#c'
+endfunc
+
+" Test 'tabline' with truncated double-width label at the start.
+func Test_tabline_truncated_double_width()
+  tabnew
+  redraw
+  call assert_match('X$', Screenline(1))
+  let attr_TabLineFill = screenattr(1, &columns - 1)
+  let attr_TabLine = screenattr(1, &columns)
+  call assert_notequal(attr_TabLine, attr_TabLineFill)
+
+  set tabline=%!TruncTabLine()
+  redraw
+  call assert_equal('<a' .. repeat('b', &columns - 4) .. 'c', Screenline(1))
+  call assert_equal(attr_TabLineFill, screenattr(1, &columns - 2))
+  call assert_equal(attr_TabLine, screenattr(1, &columns - 1))
+  call assert_equal(attr_TabLine, screenattr(1, &columns))
+
+  bw!
+  set tabline=
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab