src/vs/workbench/services/views/browser/viewDescriptorService.ts/ViewDescriptorService/getOrCreateDefaultViewContainerLocationContextKey
class ViewDescriptorService:	private getOrCreateDefaultViewContainerLocationContextKey(viewContainer: ViewContainer): IContextKey<boolean> {
		const defaultViewContainerLocationContextKeyId = `${viewContainer.id}.defaultViewContainerLocation`;
		let contextKey = this.defaultViewContainerLocationContextKeys.get(defaultViewContainerLocationContextKeyId);
		if (!contextKey) {
			contextKey = new RawContextKey(defaultViewContainerLocationContextKeyId, false).bindTo(this.contextKeyService);
			this.defaultViewContainerLocationContextKeys.set(defaultViewContainerLocationContextKeyId, contextKey);
		}
		return contextKey;
	}