Bugfix: don’t kill parent when currently in tree_close() for a child of this parent

src/handlers.c

@@ -436,7 +436,7 @@ int handle_unmap_notify_event(void *data, xcb_connection_t *conn, xcb_unmap_noti
         return 1;
     }
 
-    tree_close(con, false);
+    tree_close(con, false, false);
     tree_render();
     x_push_changes(croot);
     return 1;