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fix: inline math touching an em dash or en dash is not rendered (#31901)

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In chat replies, inline math written right next to an em dash or en dash, with either $...$ or \(...\), was left unrendered, as in "constants—\(e\), \(i\) and \(0\)—in one equation" where the 0 showed up as plain "(0)". Both dashes are now allowed directly before or after a formula, like spaces, commas and brackets already are, so the math renders whenever a dash touches it.
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Classic298 2026-10-05 04:41:57 +02:00 • committed by GitHub
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src/lib/utils/marked/katex-extension.ts
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@ -10,7 +10,7 @@ const DELIMITER_LIST = [
// Defines characters that are allowed to immediately precede or follow a math delimiter.
const ALLOWED_SURROUNDING_CHARS =
'\\s。，、､;；„“‘’“”（）「」『』［］《》【】‹›«»…⋯:：？！～⇒?!-\\/:-@\\[-`{-~\\p{Script=Han}\\p{Script=Hiragana}\\p{Script=Katakana}\\p{Script=Hangul}';
'\\s。，、､;；„“‘’“”（）「」『』［］《》【】‹›«»…⋯–—:：？！～⇒?!-\\/:-@\\[-`{-~\\p{Script=Han}\\p{Script=Hiragana}\\p{Script=Katakana}\\p{Script=Hangul}';
// Modified to fit more formats in different languages. Originally: '\\s?。，、；!-\\/:-@\\[-`{-~\\p{Script=Han}\\p{Script=Hiragana}\\p{Script=Katakana}\\p{Script=Hangul}';
// Pre-compile the surrounding character regex once at module load time.