From 8e03389de1606b9be4638bd918c382323d803e4c Mon Sep 17 00:00:00 2001
From: Classic298 <27028174+Classic298@users.noreply.github.com>
Date: Mon, 5 Oct 2026 04:41:57 +0200
Subject: [PATCH] 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.
---
 src/lib/utils/marked/katex-extension.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/utils/marked/katex-extension.ts b/src/lib/utils/marked/katex-extension.ts
index 073ee581d5..81425e5fe2 100644
--- a/src/lib/utils/marked/katex-extension.ts
+++ b/src/lib/utils/marked/katex-extension.ts
@@ -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.