From d92bbd75b2fc9927cf969dfb2a64d4f157a5f4a6 Mon Sep 17 00:00:00 2001
From: Jinjing <6427696+AmethystLiang@users.noreply.github.com>
Date: Fri, 26 Jun 2026 23:57:10 -0700
Subject: [PATCH] Protect code spans when stripping HTML tags in mobile preview

Ensure HTML-like content within code spans is not erroneously removed
by the tag stripping logic. We now protect markdown code blocks and
restore them after stripping tags and decoding HTML entities.
---
 mobile/src/components/MobileMarkdown.test.ts          | 3 +++
 mobile/src/components/mobile-markdown-preview-html.ts | 7 +++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/mobile/src/components/MobileMarkdown.test.ts b/mobile/src/components/MobileMarkdown.test.ts
index 41f282c01d4..52eb0e5ad2b 100644
--- a/mobile/src/components/MobileMarkdown.test.ts
+++ b/mobile/src/components/MobileMarkdown.test.ts
@@ -80,6 +80,9 @@ describe('parseMobileMarkdown', () => {
     expect(normalizeMobileMarkdownPreviewHtml('<p>Use <code>Array&lt;string&gt;</code></p>')).toBe(
       'Use `Array<string>`'
     )
+    expect(
+      normalizeMobileMarkdownPreviewHtml('<p>Use <code>&lt;div&gt;x&lt;/div&gt;</code></p>')
+    ).toBe('Use `<div>x</div>`')
   })
 
   it('does not replace literal code placeholder text in markdown prose', () => {
diff --git a/mobile/src/components/mobile-markdown-preview-html.ts b/mobile/src/components/mobile-markdown-preview-html.ts
index 5de546ded53..4c72e2cb4c3 100644
--- a/mobile/src/components/mobile-markdown-preview-html.ts
+++ b/mobile/src/components/mobile-markdown-preview-html.ts
@@ -50,8 +50,9 @@ function decodeHtmlEntities(value: string, preserveEscapedEntities = false): str
 }
 
 function stripTags(value: string): string {
-  return decodeHtmlEntities(
-    value
+  const { protectedText, codeSpans, placeholderPrefix } = protectMarkdownCode(value)
+  const stripped = decodeHtmlEntities(
+    protectedText
       .replace(/<!--[\s\S]*?-->/g, '')
       .replace(/<\/?([A-Za-z][A-Za-z0-9:-]*)(?:\s[^<>]*)?\/?>/g, (tag, name: string) =>
         strippableHtmlTagNames.has(name.toLowerCase()) ? '' : tag
@@ -61,6 +62,8 @@ function stripTags(value: string): string {
     .replace(/[ \t]+\n/g, '\n')
     .replace(/\n{3,}/g, '\n\n')
     .trim()
+
+  return restoreMarkdownCode(stripped, codeSpans, placeholderPrefix)
 }
 
 function attrValue(tag: string, name: string): string {