x11: Balance an error trap

We are pushing an error trap, and never popping it from the stack.

gdk/x11/gdkdnd-x11.c

@@ -2701,7 +2701,7 @@ drag_context_grab (GdkDragContext *context)
 
   g_set_object (&x11_context->grab_seat, seat);
 
-  gdk_error_trap_push ();
+  gdk_x11_display_error_trap_push (gdk_window_get_display (x11_context->ipc_window));
 
   for (i = 0; i < G_N_ELEMENTS (grab_keys); ++i)
     {
@@ -2753,6 +2753,8 @@ drag_context_grab (GdkDragContext *context)
         }
     }
 
+  gdk_x11_display_error_trap_pop_ignored (gdk_window_get_display (x11_context->ipc_window));
+
   return TRUE;
 }