syntax, TUI: support "strikethrough"

fix #3436

Includes:
vim-patch:8.0.1038: strike-through text not supported

2 files changed, 28 insertions, 1 deletions

diff --git a/test/functional/ui/highlight_spec.lua b/test/functional/ui/highlight_spec.lua
index 47b2d23c9b..f40f658275 100644
--- a/test/functional/ui/highlight_spec.lua
+++ b/test/functional/ui/highlight_spec.lua
@@ -412,6 +412,32 @@ describe('highlight', function()
     ]])
   end)
 
+  it('strikethrough', function()
+    screen:detach()
+    screen = Screen.new(25,6)
+    screen:attach()
+    feed_command('syntax on')
+    feed_command('syn keyword TmpKeyword foo')
+    feed_command('hi! Awesome cterm=strikethrough gui=strikethrough')
+    feed_command('hi link TmpKeyword Awesome')
+    insert([[
+      foo
+      foo bar
+      foobarfoobar
+      ]])
+    screen:expect([[
+      {1:foo}                      |
+      {1:foo} bar                  |
+      foobarfoobar             |
+      ^                         |
+      {2:~                        }|
+                               |
+    ]],{
+      [1] = {strikethrough = true},
+      [2] = {bold = true, foreground = Screen.colors.Blue1},
+    })
+  end)
+
   it('guisp (special/undercurl)', function()
     feed_command('syntax on')
     feed_command('syn keyword TmpKeyword neovim')
diff --git a/test/functional/ui/screen.lua b/test/functional/ui/screen.lua
index 12abfb2ad9..06a2ac3ca2 100644
--- a/test/functional/ui/screen.lua
+++ b/test/functional/ui/screen.lua
@@ -1509,7 +1509,8 @@ function Screen:_equal_attrs(a, b)
        a.underline == b.underline and a.undercurl == b.undercurl and
        a.italic == b.italic and a.reverse == b.reverse and
        a.foreground == b.foreground and a.background == b.background and
-       a.special == b.special and a.blend == b.blend
+       a.special == b.special and a.blend == b.blend and
+       a.strikethrough == b.strikethrough
 end
 
 function Screen:_equal_info(a, b)