src/vs/workbench/browser/parts/activitybar/activitybarPart.ts/ActivitybarPart/onDidChangeViewContainerLocation
class ActivitybarPart:	private onDidChangeViewContainerLocation(container: ViewContainer, from: ViewContainerLocation, to: ViewContainerLocation) {
		if (from === this.location) {
			this.onDidDeregisterViewContainer(container);
		}

		if (to === this.location) {
			this.onDidRegisterViewContainers([container]);
		}
	}