src/vs/workbench/api/browser/viewsExtensionPoint.ts/ViewsExtensionHandler/handleAndRegisterCustomViewContainers
class ViewsExtensionHandler:	private handleAndRegisterCustomViewContainers() {
		viewsContainersExtensionPoint.setHandler((extensions, { added, removed }) => {
			if (removed.length) {
				this.removeCustomViewContainers(removed);
			}
			if (added.length) {
				this.addCustomViewContainers(added, this.viewContainersRegistry.all);
			}
		});
	}