src/vs/workbench/services/views/browser/viewDescriptorService.ts/ViewDescriptorService/onDidDeregisterViewContainer
class ViewDescriptorService:	private onDidDeregisterViewContainer(viewContainer: ViewContainer): void {
		const viewContainerModelItem = this.viewContainerModels.get(viewContainer);
		if (viewContainerModelItem) {
			viewContainerModelItem.disposable.dispose();
			this.viewContainerModels.delete(viewContainer);
		}
	}