src/vs/workbench/api/browser/mainThreadSCM.ts/MainThreadSCM/$unregisterGroup
class MainThreadSCM:	$unregisterGroup(sourceControlHandle: number, handle: number): void {
		const repository = this._repositories.get(sourceControlHandle);

		if (!repository) {
			return;
		}

		const provider = repository.provider as MainThreadSCMProvider;
		provider.$unregisterGroup(handle);
	}