Merge pull request #4540 from KillTheMule/vim-patch-1236

vim-patch: 7.4.1236

test/functional/ui/highlight_spec.lua

@@ -1,5 +1,6 @@
 local helpers = require('test.functional.helpers')
 local Screen = require('test.functional.ui.screen')
+local os = require('os')
 local clear, feed = helpers.clear, helpers.feed
 local execute, request, eq = helpers.execute, helpers.request, helpers.eq
 
@@ -16,6 +17,73 @@ describe('color scheme compatibility', function()
   end)
 end)
 
+describe('manual syntax highlight', function()
+  -- When using manual syntax highlighting, it should be preserved even when
+  -- switching buffers... bug did only occur without :set hidden
+  -- Ref: vim patch 7.4.1236
+  local screen
+
+  before_each(function()
+    clear()
+    screen = Screen.new(20,5)
+    screen:attach()
+    --ignore highligting of ~-lines
+    screen:set_default_attr_ignore( {{bold=true, foreground=Screen.colors.Blue}} )
+    --syntax highlight for vimcscripts "echo"
+    screen:set_default_attr_ids( {[1] = {bold=true, foreground=Screen.colors.Brown}} )
+  end)
+
+  after_each(function()
+    screen:detach()
+    os.remove('Xtest-functional-ui-highlight.tmp.vim')
+  end)
+
+  -- test with "set hidden" even if the bug did not occur this way
+  it("works with buffer switch and 'hidden'", function()
+    execute('e tmp1.vim')
+    execute('e Xtest-functional-ui-highlight.tmp.vim')
+    execute('filetype on')
+    execute('syntax manual')
+    execute('set ft=vim')
+    execute('set syntax=ON')
+    feed('iecho 1<esc>0')
+
+    execute('set hidden')
+    execute('w')
+    execute('bn')
+    execute('bp')
+    screen:expect([[
+      {1:^echo} 1              |
+      ~                   |
+      ~                   |
+      ~                   |
+      <f 1 --100%-- col 1 |
+    ]])
+  end)
+
+  it("works with buffer switch and 'nohidden'", function()
+    execute('e tmp1.vim')
+    execute('e Xtest-functional-ui-highlight.tmp.vim')
+    execute('filetype on')
+    execute('syntax manual')
+    execute('set ft=vim')
+    execute('set syntax=ON')
+    feed('iecho 1<esc>0')
+
+    execute('set nohidden')
+    execute('w')
+    execute('bn')
+    execute('bp')
+    screen:expect([[
+      {1:^echo} 1              |
+      ~                   |
+      ~                   |
+      ~                   |
+      <ht.tmp.vim" 1L, 7C |
+    ]])
+  end)
+end)
+
 
 describe('Default highlight groups', function()
   -- Test the default attributes for highlight groups shown by the :highlight
@@ -38,6 +106,7 @@ describe('Default highlight groups', function()
   after_each(function()
     screen:detach()
   end)
+
   it('window status bar', function()
     screen:set_default_attr_ids({
       [1] = {reverse = true, bold = true},  -- StatusLine