src/vs/workbench/services/views/common/viewContainerModel.ts/ViewContainerModel/broadCastRemovedVisibleViewDescriptors
class ViewContainerModel:	private broadCastRemovedVisibleViewDescriptors(removed: IViewDescriptorRef[]): void {
		if (removed.length) {
			this._onDidRemoveVisibleViewDescriptors.fire(removed.sort((a, b) => b.index - a.index));
		}
	}