vim-patch:8.1.0574: 'commentstring', fold marker in C (#9339)

Problem:    'commentstring' not used when adding fold marker in C.
Solution:   Require white space before middle comment part. (mostly by
            Hirohito Higashi)
https://github.com/vim/vim/commit/4af7259b2b35e85c590d54908fcd248d2c733be8

1 files changed, 29 insertions, 0 deletions

diff --git a/src/nvim/testdir/test_fold.vim b/src/nvim/testdir/test_fold.vim
index 85f58ada7e..0b4b5d1922 100644
--- a/src/nvim/testdir/test_fold.vim
+++ b/src/nvim/testdir/test_fold.vim
@@ -514,6 +514,35 @@ func Test_fold_marker()
   enew!
 endfunc
 
+" test create fold markers with C filetype
+func Test_fold_create_marker_in_C()
+  enew!
+  set fdm=marker fdl=9
+  set filetype=c
+
+  let content = [
+	\ '/*',
+	\ ' * comment',
+	\ ' * ',
+	\ ' *',
+	\ ' */',
+	\ 'int f(int* p) {',
+	\ '    *p = 3;',
+	\ '    return 0;',
+	\ '}'
+	\]
+  for c in range(len(content) - 1)
+    bw!
+    call append(0, content)
+    call cursor(c + 1, 1)
+    norm! zfG
+    call assert_equal(content[c] . (c < 4 ? '{{{' : '/*{{{*/'), getline(c + 1))
+  endfor
+
+  set fdm& fdl&
+  enew!
+endfunc
+
 " test folding with indent
 func Test_fold_indent()
   enew!