src/vs/workbench/browser/parts/views/viewsService.ts/ViewsService/onDidChangeContainers
class ViewsService:	private onDidChangeContainers(added: ReadonlyArray<{ container: ViewContainer; location: ViewContainerLocation }>, removed: ReadonlyArray<{ container: ViewContainer; location: ViewContainerLocation }>): void {
		for (const { container, location } of removed) {
			this.deregisterPaneComposite(container, location);
		}
		for (const { container, location } of added) {
			this.onDidRegisterViewContainer(container, location);
		}
	}