MultitaskingView: Make sure position is up to date when ws reordered

When workspaces are reordered while we are closed (which now can happen
in the dock) make sure that we are positioned at the active index.

Author: leolost2605

src/Widgets/MultitaskingView/MultitaskingView.vala

@@ -94,7 +94,7 @@ public class Gala.MultitaskingView : ActorTarget, ActivatableComponent {
         unowned var manager = display.get_workspace_manager ();
         manager.workspace_added.connect (add_workspace);
         manager.workspace_removed.connect (remove_workspace);
-        manager.workspaces_reordered.connect (() => reposition_icon_groups (false));
+        manager.workspaces_reordered.connect (on_workspaces_reordered);
         manager.workspace_switched.connect (on_workspace_switched);
 
         manager.bind_property (
@@ -397,6 +397,15 @@ public class Gala.MultitaskingView : ActorTarget, ActivatableComponent {
         workspaces_gesture_controller.progress = -manager.get_active_workspace_index ();
     }
 
+    private void on_workspaces_reordered () {
+        if (!visible) {
+            unowned var manager = display.get_workspace_manager ();
+            workspaces_gesture_controller.progress = -manager.get_active_workspace_index ();
+        }
+
+        reposition_icon_groups (false);
+    }
+
     private void on_workspace_switched (int from, int to) {
         if ((int) (-get_current_commit (SWITCH_WORKSPACE)) != to) {
             workspaces_gesture_controller.goto (-to);