vim-patch:8.1.2019: 'cursorline' always highlights the whole line (#15161)

Problem:    'cursorline' always highlights the whole line.
Solution:   Add 'cursorlineopt' to specify what is highlighted.
            (closes vim/vim#4693)
https://github.com/vim/vim/commit/410e98a70bc00ea4bed51e55a8fe20e56a72c087

2 files changed, 109 insertions, 0 deletions

diff --git a/src/nvim/testdir/test_alot.vim b/src/nvim/testdir/test_alot.vim
index b5c50b5894..cc767a9bcf 100644
--- a/src/nvim/testdir/test_alot.vim
+++ b/src/nvim/testdir/test_alot.vim
@@ -7,6 +7,7 @@ source test_cd.vim
 source test_changedtick.vim
 source test_compiler.vim
 source test_cursor_func.vim
+source test_cursorline.vim
 source test_ex_equal.vim
 source test_ex_undo.vim
 source test_ex_z.vim
diff --git a/src/nvim/testdir/test_cursorline.vim b/src/nvim/testdir/test_cursorline.vim
new file mode 100644
index 0000000000..46fbd0cd64
--- /dev/null
+++ b/src/nvim/testdir/test_cursorline.vim
@@ -0,0 +1,108 @@
+" Test for cursorline and cursorlineopt
+"
+source view_util.vim
+source check.vim
+
+function! s:screen_attr(lnum) abort
+  return map(range(1, 8), 'screenattr(a:lnum, v:val)')
+endfunction
+
+function! s:test_windows(h, w) abort
+  call NewWindow(a:h, a:w)
+endfunction
+
+function! s:close_windows() abort
+  call CloseWindow()
+endfunction
+
+function! s:new_hi() abort
+  redir => save_hi
+  silent! hi CursorLineNr
+  redir END
+  let save_hi = join(split(substitute(save_hi, '\s*xxx\s*', ' ', ''), "\n"), '')
+  exe 'hi' save_hi 'ctermbg=0 guibg=Black'
+  return save_hi
+endfunction
+
+func Test_cursorline_highlight1()
+  let save_hi = s:new_hi()
+  try
+    call s:test_windows(10, 20)
+    call setline(1, repeat(['aaaa'], 10))
+    redraw
+    let attr01 = s:screen_attr(1)
+    call assert_equal(repeat([attr01[0]], 8), attr01)
+
+    setl number numberwidth=4
+    redraw
+    let attr11 = s:screen_attr(1)
+    call assert_equal(repeat([attr11[0]], 4), attr11[0:3])
+    call assert_equal(repeat([attr11[4]], 4), attr11[4:7])
+    call assert_notequal(attr11[0], attr11[4])
+
+    setl cursorline
+    redraw
+    let attr21 = s:screen_attr(1)
+    let attr22 = s:screen_attr(2)
+    call assert_equal(repeat([attr21[0]], 4), attr21[0:3])
+    call assert_equal(repeat([attr21[4]], 4), attr21[4:7])
+    call assert_equal(attr11, attr22)
+    call assert_notequal(attr22, attr21)
+
+    setl nocursorline relativenumber
+    redraw
+    let attr31 = s:screen_attr(1)
+    call assert_equal(attr21[0:3], attr31[0:3])
+    call assert_equal(attr11[4:7], attr31[4:7])
+
+    call s:close_windows()
+  finally
+    exe 'hi' save_hi
+  endtry
+endfunc
+
+func Test_cursorline_highlight2()
+  CheckOption cursorlineopt
+
+  let save_hi = s:new_hi()
+  try
+    call s:test_windows(10, 20)
+    call setline(1, repeat(['aaaa'], 10))
+    redraw
+    let attr0 = s:screen_attr(1)
+    call assert_equal(repeat([attr0[0]], 8), attr0)
+
+    setl number
+    redraw
+    let attr1 = s:screen_attr(1)
+    call assert_notequal(attr0[0:3], attr1[0:3])
+    call assert_equal(attr0[0:3], attr1[4:7])
+
+    setl cursorline cursorlineopt=both
+    redraw
+    let attr2 = s:screen_attr(1)
+    call assert_notequal(attr1[0:3], attr2[0:3])
+    call assert_notequal(attr1[4:7], attr2[4:7])
+
+    setl cursorlineopt=line
+    redraw
+    let attr3 = s:screen_attr(1)
+    call assert_equal(attr1[0:3], attr3[0:3])
+    call assert_equal(attr2[4:7], attr3[4:7])
+
+    setl cursorlineopt=number
+    redraw
+    let attr4 = s:screen_attr(1)
+    call assert_equal(attr2[0:3], attr4[0:3])
+    call assert_equal(attr1[4:7], attr4[4:7])
+
+    setl nonumber
+    redraw
+    let attr5 = s:screen_attr(1)
+    call assert_equal(attr0, attr5)
+
+    call s:close_windows()
+  finally
+    exe 'hi' save_hi
+  endtry
+endfunc