src/vs/workbench/services/views/common/viewContainerModel.ts/ViewContainerModel/triggerOnDidAddVisibleViewDescriptors
class ViewContainerModel:	private triggerOnDidAddVisibleViewDescriptors(added: IAddedViewDescriptorRef[]) {
		this._onDidAddVisibleViewDescriptors.fire(added.sort((a, b) => a.index - b.index));
	}