src/vs/platform/undoRedo/common/undoRedoService.ts/UndoRedoService/_continueUndoInGroup
class UndoRedoService:	private _continueUndoInGroup(groupId: number, undoConfirmed: boolean): Promise<void> | void {
		if (!groupId) {
			return;
		}

		const [, matchedStrResource] = this._findClosestUndoElementInGroup(groupId);
		if (matchedStrResource) {
			return this._undo(matchedStrResource, 0, undoConfirmed);
		}
	}