src/vs/workbench/browser/parts/activitybar/activitybarPart.ts/ActivitybarPart/showOrHideViewContainer
class ActivitybarPart:	private showOrHideViewContainer(viewContainer: ViewContainer): void {
		let contextKey = this.enabledViewContainersContextKeys.get(viewContainer.id);
		if (!contextKey) {
			contextKey = this.contextKeyService.createKey(getEnabledViewContainerContextKey(viewContainer.id), false);
			this.enabledViewContainersContextKeys.set(viewContainer.id, contextKey);
		}
		if (this.shouldBeHidden(viewContainer)) {
			contextKey.set(false);
			this.hideComposite(viewContainer.id);
		} else {
			contextKey.set(true);
			this.addComposite(viewContainer);
		}
	}