src/vs/workbench/services/views/browser/viewDescriptorService.ts/ViewDescriptorService/onDidDeregisterViews
class ViewDescriptorService:	private onDidDeregisterViews(views: IViewDescriptor[], viewContainer: ViewContainer): void {
		// When views are registered, we need to regroup them based on the customizations
		const regroupedViews = this.regroupViews(viewContainer.id, views);
		this.deregisterGroupedViews(regroupedViews);
		this.contextKeyService.bufferChangeEvents(() => {
			views.forEach(viewDescriptor => this.getOrCreateMovableViewContextKey(viewDescriptor).set(false));
		});
	}