fix: 正規化されていない状態のhashtagが連合されてきたhtmlに含まれているとhashtagが正しくhashtagに復元されない問題を修正 (#13733)

packages/backend/src/core/MfmService.ts

@@ -10,6 +10,7 @@ import { Window } from 'happy-dom';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { intersperse } from '@/misc/prelude/array.js';
+import { normalizeForSearch } from '@/misc/normalize-for-search.js';
 import type { IMentionedRemoteUsers } from '@/models/Note.js';
 import { bindThis } from '@/decorators.js';
 import * as TreeAdapter from '../../node_modules/parse5/dist/tree-adapters/default.js';
@@ -33,6 +34,8 @@ export class MfmService {
 		// some AP servers like Pixelfed use br tags as well as newlines
 		html = html.replace(/<br\s?\/?>\r?\n/gi, '\n');
 
+		const normalizedHashtagNames = hashtagNames == null ? undefined : new Set<string>(hashtagNames.map(x => normalizeForSearch(x)));
+
 		const dom = parse5.parseFragment(html);
 
 		let text = '';
@@ -85,7 +88,7 @@ export class MfmService {
 					const href = node.attrs.find(x => x.name === 'href');
 
 					// ハッシュタグ
-					if (hashtagNames && href && hashtagNames.map(x => x.toLowerCase()).includes(txt.toLowerCase())) {
+					if (normalizedHashtagNames && href && normalizedHashtagNames.has(normalizeForSearch(txt))) {
 						text += txt;
 					// メンション
 					} else if (txt.startsWith('@') && !(rel && rel.value.startsWith('me '))) {