complete: disable folding when completing

Fixes vim/vim#643

src/nvim/edit.c

@@ -165,10 +165,6 @@ static int compl_restarting = FALSE;            /* don't insert match */
  * FALSE the word to be completed must be located. */
 static int compl_started = FALSE;
 
-/* Set when doing something for completion that may call edit() recursively,
- * which is not allowed. */
-static int compl_busy = FALSE;
-
 static int compl_matches = 0;
 static char_u     *compl_pattern = NULL;
 static int compl_direction = FORWARD;

src/nvim/fold.c

@@ -762,6 +762,10 @@ void clearFolding(win_T *win)
  */
 void foldUpdate(win_T *wp, linenr_T top, linenr_T bot)
 {
+  if (compl_busy) {
+    return;
+  }
+
   fold_T      *fp;
   if (wp->w_buffer->terminal) {
     return;

src/nvim/globals.h

@@ -214,6 +214,10 @@ EXTERN int compl_length INIT(= 0);
  * stop looking for matches. */
 EXTERN int compl_interrupted INIT(= FALSE);
 
+// Set when doing something for completion that may call edit() recursively,
+// which is not allowed. Also used to disable folding during completion
+EXTERN int compl_busy INIT(= false);
+
 /* List of flags for method of completion. */
 EXTERN int compl_cont_status INIT(= 0);
 # define CONT_ADDING    1       /* "normal" or "adding" expansion */

test/functional/viml/completion_spec.lua

@@ -141,4 +141,10 @@ describe('completion', function()
         June]])
     end)
   end)
+
+  it('disables folding during completion', function ()
+	  execute("set foldmethod=indent")
+	  feed('i<Tab>foo<CR><Tab>bar<Esc>ggA<C-x><C-l>')
+	  eq(-1, eval('foldclosed(1)'))
+  end)
 end)