sync adjustment to current active workspace

In case the workspace context has changed

js/ui/workspacesView.js

@@ -515,6 +515,9 @@ class WorkspacesView extends WorkspacesViewBase {
             this._workspaces.splice(j, 1);
         }
 
+        this._scrollAdjustment.value =
+            workspaceManager.get_active_workspace_index();
+
         this._updateWorkspacesState();
         this._updateVisibility();
     }