Merge remote-tracking branch 'misskey-original/develop' into develop

# Conflicts:
#	packages/backend/src/models/json-schema/user.ts
#	packages/frontend/src/components/MkNote.vue
#	packages/frontend/src/components/MkReactionsViewer.reaction.vue
#	packages/frontend/src/pages/settings/mute-block.word-mute.vue
#	packages/misskey-js/etc/misskey-js.api.md

packages/frontend/src/components/MkAutocomplete.vue

@@ -246,29 +246,7 @@ function exec() {
 			return;
 		}
 
-		const matched: EmojiDef[] = [];
-		const max = 30;
-
-		emojiDb.value.some(x => {
-			if (x.name.startsWith(props.q ?? '') && !x.aliasOf && !matched.some(y => y.emoji === x.emoji)) matched.push(x);
-			return matched.length === max;
-		});
-
-		if (matched.length < max) {
-			emojiDb.value.some(x => {
-				if (x.name.startsWith(props.q ?? '') && !matched.some(y => y.emoji === x.emoji)) matched.push(x);
-				return matched.length === max;
-			});
-		}
-
-		if (matched.length < max) {
-			emojiDb.value.some(x => {
-				if (x.name.includes(props.q ?? '') && !matched.some(y => y.emoji === x.emoji)) matched.push(x);
-				return matched.length === max;
-			});
-		}
-
-		emojis.value = matched;
+		emojis.value = emojiAutoComplete(props.q, emojiDb.value);
 	} else if (props.type === 'mfmTag') {
 		if (!props.q || props.q === '') {
 			mfmTags.value = MFM_TAGS;
@@ -279,6 +257,78 @@ function exec() {
 	}
 }
 
+type EmojiScore = { emoji: EmojiDef, score: number };
+
+function emojiAutoComplete(query: string | null, emojiDb: EmojiDef[], max = 30): EmojiDef[] {
+	if (!query) {
+		return [];
+	}
+
+	const matched = new Map<string, EmojiScore>();
+
+	// 前方一致（エイリアスなし）
+	emojiDb.some(x => {
+		if (x.name.startsWith(query) && !x.aliasOf) {
+			matched.set(x.name, { emoji: x, score: query.length + 1 });
+		}
+		return matched.size === max;
+	});
+
+	// 前方一致（エイリアス込み）
+	if (matched.size < max) {
+		emojiDb.some(x => {
+			if (x.name.startsWith(query) && !matched.has(x.aliasOf ?? x.name)) {
+				matched.set(x.aliasOf ?? x.name, { emoji: x, score: query.length });
+			}
+			return matched.size === max;
+		});
+	}
+
+	// 部分一致（エイリアス込み）
+	if (matched.size < max) {
+		emojiDb.some(x => {
+			if (x.name.includes(query) && !matched.has(x.aliasOf ?? x.name)) {
+				matched.set(x.aliasOf ?? x.name, { emoji: x, score: query.length - 1 });
+			}
+			return matched.size === max;
+		});
+	}
+
+	// 簡易あいまい検索（3文字以上）
+	if (matched.size < max && query.length > 3) {
+		const queryChars = [...query];
+		const hitEmojis = new Map<string, EmojiScore>();
+
+		for (const x of emojiDb) {
+			// 文字列の位置を進めながら、クエリの文字を順番に探す
+
+			let pos = 0;
+			let hit = 0;
+			for (const c of queryChars) {
+				pos = x.name.indexOf(c, pos);
+				if (pos <= -1) break;
+				hit++;
+			}
+
+			// 半分以上の文字が含まれていればヒットとする
+			if (hit > Math.ceil(queryChars.length / 2) && hit - 2 > (matched.get(x.aliasOf ?? x.name)?.score ?? 0)) {
+				hitEmojis.set(x.aliasOf ?? x.name, { emoji: x, score: hit - 2 });
+			}
+		}
+
+		// ヒットしたものを全部追加すると雑多になるので、先頭の6件程度だけにしておく（6件＝オートコンプリートのポップアップのサイズ分）
+		[...hitEmojis.values()]
+			.sort((x, y) => y.score - x.score)
+			.slice(0, 6)
+			.forEach(it => matched.set(it.emoji.name, it));
+	}
+
+	return [...matched.values()]
+		.sort((x, y) => y.score - x.score)
+		.slice(0, max)
+		.map(it => it.emoji);
+}
+
 function onMousedown(event: Event) {
 	if (!contains(rootEl.value, event.target) && (rootEl.value !== event.target)) props.close();
 }