src/vs/workbench/contrib/comments/browser/commentService.ts/CommentService/toggleReaction
class CommentService:	async toggleReaction(owner: string, resource: URI, thread: CommentThread, comment: Comment, reaction: CommentReaction): Promise<void> {
		const commentController = this._commentControls.get(owner);

		if (commentController) {
			return commentController.toggleReaction(resource, thread, comment, reaction, CancellationToken.None);
		} else {
			throw new Error('Not supported');
		}
	}