Fix gala's workspace reorder with mutter 3.34

fix-reorder-workspaces-mutter-334.patch

diff --git a/src/Widgets/MultitaskingView.vala b/src/Widgets/MultitaskingView.vala
index cede706..35a1f28 100644
--- a/src/Widgets/MultitaskingView.vala
+++ b/src/Widgets/MultitaskingView.vala
@@ -92,6 +92,9 @@ namespace Gala
 
 			manager.workspace_added.connect (add_workspace);
 			manager.workspace_removed.connect (remove_workspace);
+#if HAS_MUTTER334
+			manager.workspaces_reordered.connect (() => update_positions (false));
+#endif
 			manager.workspace_switched.connect_after ((from, to, direction) => {
 				update_positions (opened);
 			});