Merge pull request #1184 from Shougo/vim-patch-7.4.369

vim-patch:7.4.369

src/nvim/buffer.c

@@ -4425,8 +4425,8 @@ linenr_T buf_delsign(
     }
 
     /* When deleted the last sign needs to redraw the windows to remove the
-     * sign column. */
+     * sign column. Not when curwin is NULL (this means we're exiting). */
-    if (buf->b_signlist == NULL) {
+    if (buf->b_signlist != NULL && curwin != NULL) {
         redraw_buf_later(buf, NOT_VALID);
         changed_cline_bef_curs();
     }

src/nvim/version.c

@@ -226,7 +226,7 @@ static int included_patches[] = {
   //372,
   371,
   370,
-  //369,
+  369,
   368,
   367,
   //366,

src/nvim/window.c

@@ -2001,6 +2001,10 @@ void win_free_all(void)
 
   while (firstwin != NULL)
     (void)win_free_mem(firstwin, &dummy, NULL);
+
+  // No window should be used after this. Set curwin to NULL to crash
+  // instead of using freed memory.
+  curwin = NULL;
 }
 
 #endif