extensions/git/src/git.ts/Repository/getMergeMessage
class Repository:	async getMergeMessage(): Promise<string | undefined> {
		const mergeMsgPath = path.join(this.repositoryRoot, '.git', 'MERGE_MSG');

		try {
			const raw = await fs.readFile(mergeMsgPath, 'utf8');
			return this.stripCommitMessageComments(raw);
		} catch {
			return undefined;
		}
	}