Fix sign column redraw

Fixed a bug introduced in SHA:aa66f2487edde49b9a5ba10cd70d706d06a94e25,
due to a misapplied patch. buf_del_sign should redraw the window if the
sign deleted was the last one in the buffer.
Also moved the curwin verification to the correct function.

1 files changed, 4 insertions, 6 deletions

diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index 6ce3c77c66..b76bad67f6 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -4423,8 +4423,8 @@ linenr_T buf_delsign(
     }
 
     /* When deleted the last sign needs to redraw the windows to remove the
-     * sign column. Not when curwin is NULL (this means we're exiting). */
-    if (buf->b_signlist != NULL && curwin != NULL) {
+     * sign column. */
+    if (buf->b_signlist == NULL) {
         redraw_buf_later(buf, NOT_VALID);
         changed_cline_bef_curs();
     }
@@ -4479,11 +4479,9 @@ void buf_delete_signs(buf_T *buf)
     signlist_T *next;
 
     // When deleting the last sign need to redraw the windows to remove the
-    // sign column.
-    if (buf->b_signlist != NULL) {
+    // sign column. Not when curwin is NULL (this means we're exiting).
+    if (buf->b_signlist != NULL && curwin != NULL){
       redraw_buf_later(buf, NOT_VALID);
-      // TODO(oni-link): Is this call necessary if curwin is not a viewport
-      // for buf?
       changed_cline_bef_curs();
     }