update panel and fix issue with resetting views

src/vs/workbench/browser/parts/compositeBarActions.ts

@@ -69,6 +69,7 @@ export class ActivityAction extends Action {
 	}
 
 	set activity(activity: IActivity) {
+		this._label = activity.name;
 		this._activity = activity;
 		this._onDidChangeActivity.fire(this);
 	}

src/vs/workbench/browser/parts/panel/panelPart.ts

@@ -216,8 +216,7 @@ export class PanelPart extends CompositePart<Panel> implements IPanelService {
 
 			const disposables = new DisposableStore();
 			disposables.add(viewContainerModel.onDidChangeActiveViewDescriptors(() => this.onDidChangeActiveViews(panel, viewContainerModel, viewContainer.hideIfEmpty)));
-			disposables.add(viewContainerModel.onDidChangeAllViewDescriptors(() => this.onDidUpdateViews(panel, viewContainerModel)));
-			disposables.add(viewContainerModel.onDidMoveVisibleViewDescriptors(() => this.onDidUpdateViews(panel, viewContainerModel)));
+			disposables.add(viewContainerModel.onDidChangeContainerInfo(() => this.onDidUpdateViews(panel, viewContainerModel)));
 
 			this.panelDisposables.set(panel.id, disposables);
 		}