test: convert another test in test_matchadd_conceal.vim to Lua (neovi…

…m#21353)

test/functional/ui/syntax_conceal_spec.lua

@@ -4,7 +4,7 @@ local clear, feed, command = helpers.clear, helpers.feed, helpers.command
 local eq = helpers.eq
 local insert = helpers.insert
 local poke_eventloop = helpers.poke_eventloop
-local expect_exit = helpers.expect_exit
+local exec = helpers.exec
 
 describe('Screen', function()
  local screen
@@ -1001,25 +1001,32 @@ describe('Screen', function()
  eq({}, grid_lines) -- no redraw was done
  end)
 
- -- Copy of Test_cursor_column_in_concealed_line_after_window_scroll in
- -- test/functional/ui/syntax_conceal_spec.lua.
- describe('concealed line after window scroll', function()
- after_each(function()
- expect_exit(command, ':qall!')
- os.remove('Xcolesearch')
- end)
-
- it('has the correct cursor column', function()
+ describe('concealed line has the correct cursor column', function()
+ -- oldtest: Test_cursor_column_in_concealed_line_after_window_scroll()
+ it('after window scroll', function()
  insert([[
- 3split
- let m = matchadd('Conceal', '=')
- setl conceallevel=2 concealcursor=nc
- normal gg
- "==expr==
- ]])
+ 3split
+ let m = matchadd('Conceal', '=')
+ setl conceallevel=2 concealcursor=nc
+ normal gg
+ "==expr==]])
+ feed('gg')
+ command('file Xcolesearch')
+ command('set nomodified')
 
- command('write Xcolesearch')
- feed(":so %<CR>")
+ command('so')
+ screen:expect{grid=[[
+ ^3split |
+ let m matchadd('Conceal', '') |
+ setl conceallevel2 concealcursornc |
+ {2:Xcolesearch }|
+ 3split |
+ let m = matchadd('Conceal', '=') |
+ setl conceallevel=2 concealcursor=nc |
+ normal gg |
+ {3:Xcolesearch }|
+ |
+ ]]}
 
  -- Jump to something that is beyond the bottom of the window,
  -- so there's a scroll down.
@@ -1033,13 +1040,42 @@ describe('Screen', function()
  normal gg |
  "{5:^expr} |
  {2:Xcolesearch }|
+ 3split |
+ let m = matchadd('Conceal', '=') |
+ setl conceallevel=2 concealcursor=nc |
  normal gg |
- "=={5:expr}== |
- |
- {0:~ }|
  {3:Xcolesearch }|
  /expr |
  ]]}
  end)
+
+ -- oldtest: Test_cursor_column_in_concealed_line_after_leftcol_change()
+ it('after leftcol change', function()
+ exec([[
+ 0put = 'ab' .. repeat('-', &columns) .. 'c'
+ call matchadd('Conceal', '-')
+ set nowrap ss=0 cole=3 cocu=n
+ ]])
+
+ -- Go to the end of the line (3 columns beyond the end of the screen).
+ -- Horizontal scroll would center the cursor in the screen line, but conceal
+ -- makes it go to screen column 1.
+ feed('$')
+
+ -- Are the concealed parts of the current line really hidden?
+ -- Is the window's cursor column properly updated for conceal?
+ screen:expect{grid=[[
+ ^c |
+ |
+ {0:~ }|
+ {0:~ }|
+ {0:~ }|
+ {0:~ }|
+ {0:~ }|
+ {0:~ }|
+ {0:~ }|
+ |
+ ]]}
+ end)
  end)
 end)