normalise emoji text

also, tests

src/internal/parser.ts

@@ -629,7 +629,7 @@ export const language = P.createLanguage({
 			P.regexp(/[\p{Letter}\p{Number}\p{Mark}_+-]+/iu),
 			mark,
 			P.alt([P.lineEnd, side]),
-		], 2).map(name => M.EMOJI_CODE(name as string));
+		], 2).map(name => M.EMOJI_CODE((name as string).normalize('NFC')));
 	},
 
 	link: r => {

test/parser.ts

@@ -338,6 +338,30 @@ hoge`;
 			const output = [EMOJI_CODE('abc')];
 			assert.deepStrictEqual(mfm.parse(input), output);
 		});
+
+		test('non-ASCII', () => {
+			const input = ':taneŝima_ĝojas:, :मार्जारः:, :鹅:, :taneŝima_malsanas:, :แมว:, and :लक्षणा:';
+			const output = [
+				EMOJI_CODE('taneŝima_ĝojas'),
+				TEXT(', '),
+				EMOJI_CODE('मार्जारः'),
+				TEXT(', '),
+				EMOJI_CODE('鹅'),
+				TEXT(', '),
+				EMOJI_CODE('taneŝima_malsanas'),
+				TEXT(', '),
+				EMOJI_CODE('แมว'),
+				TEXT(', and '),
+				EMOJI_CODE('लक्षणा'),
+			];
+			assert.deepStrictEqual(mfm.parse(input), output);
+		});
+
+		test('non-ASCII normalization', () => {
+			const input = ":fo\u{0308}o:";
+			const output = [EMOJI_CODE("f\u{00F6}o")];
+			assert.deepStrictEqual(mfm.parse(input), output);
+		});
 	});
 
 	describe('unicode emoji', () => {