From cfe51d01eefda4de18a294fe076bb0dbc05668e5 Mon Sep 17 00:00:00 2001
From: Huang Xin <chrox.huang@gmail.com>
Date: Fri, 9 Jan 2026 09:30:04 +0100
Subject: [PATCH] fix(sanitizer): normalize non-breaking spaces for WebView
 compatibility (#2893)

Convert &nbsp; to &#160; before sanitization and restore after XMLSerializer
serialization. This handles the platform difference where XMLSerializer
produces different representations of non-breaking spaces (&nbsp;, &#160;,
or \u00A0) across different WebView implementations.
---
 apps/readest-app/src/services/transformers/sanitizer.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/apps/readest-app/src/services/transformers/sanitizer.ts b/apps/readest-app/src/services/transformers/sanitizer.ts
index 08e2ea40..9498c044 100644
--- a/apps/readest-app/src/services/transformers/sanitizer.ts
+++ b/apps/readest-app/src/services/transformers/sanitizer.ts
@@ -8,7 +8,7 @@ export const sanitizerTransformer: Transformer = {
     const allowScript = ctx.viewSettings.allowScript;
     if (allowScript) return ctx.content;
 
-    const result = ctx.content;
+    const result = ctx.content.replaceAll('&nbsp;', '&#160;');
 
     const sanitized = DOMPurify.sanitize(result, {
       WHOLE_DOCUMENT: true,
@@ -40,6 +40,7 @@ export const sanitizerTransformer: Transformer = {
 
     const serializer = new XMLSerializer();
     let serialized = serializer.serializeToString(sanitized);
+    serialized = serialized.replaceAll('&#160;', '&nbsp;').replaceAll('\u00A0', '&nbsp;');
     serialized = '<?xml version="1.0" encoding="utf-8"?>' + serialized;
     serialized = serialized.replace(/(<head[^>]*>)/i, '\n$1');
     serialized = serialized.replace(/(<\/body>)(<\/html>)/i, '$1\n$2');