src/vs/workbench/browser/parts/views/viewsService.ts/ViewsService/onViewDescriptorsRemoved
class ViewsService:	private onViewDescriptorsRemoved(views: ReadonlyArray<IViewDescriptor>): void {
		for (const view of views) {
			const disposable = this.viewDisposable.get(view);
			if (disposable) {
				disposable.dispose();
				this.viewDisposable.delete(view);
			}
		}
	}