Fix MFM parsing: Ignore parent [] of URL

src/mfm/language.ts

@@ -6,8 +6,8 @@ import { toUnicode } from 'punycode';
 import { emojiRegex } from '../misc/emoji-regex';
 
 export function removeOrphanedBrackets(s: string): string {
-	const openBrackets = ['(', '「'];
-	const closeBrackets = [')', '」'];
+	const openBrackets = ['(', '「', '['];
+	const closeBrackets = [')', '」', ']'];
 	const xs = cumulativeSum(s.split('').map(c => {
 		if (openBrackets.includes(c)) return 1;
 		if (closeBrackets.includes(c)) return -1;

test/mfm.ts

@@ -843,6 +843,15 @@ describe('MFM', () => {
 				]);
 			});
 
+			it('ignore parent []', () => {
+				const tokens = parse('[https://example.com/foo]');
+				assert.deepStrictEqual(tokens, [
+					text('['),
+					leaf('url', { url: 'https://example.com/foo' }),
+					text(']')
+				]);
+			});
+
 			it('ignore parent brackets 2', () => {
 				const tokens = parse('(foo https://example.com/foo)');
 				assert.deepStrictEqual(tokens, [