firefox-repair-nbsp-behavior.patch

diff -r 62b30a28e7a4 dom/serializers/nsPlainTextSerializer.cpp
--- a/dom/serializers/nsPlainTextSerializer.cpp	Mon Sep 08 11:49:04 2025 -0400
+++ b/dom/serializers/nsPlainTextSerializer.cpp	Thu Oct 23 16:09:22 2025 +0200
@@ -108,11 +108,6 @@
 
 void nsPlainTextSerializer::CurrentLine::MaybeReplaceNbspsInContent(
     const int32_t aFlags) {
-  if (!(aFlags & nsIDocumentEncoder::OutputPersistNBSP)) {
-    // First, replace all nbsp characters with spaces,
-    // which the unicode encoder won't do for us.
-    mContent.ReplaceChar(kNBSP, kSPACE);
-  }
 }
 
 void nsPlainTextSerializer::CurrentLine::ResetContentAndIndentationHeader() {
@@ -1435,18 +1430,6 @@
 }
 
 static void ReplaceVisiblyTrailingNbsps(nsAString& aString) {
-  const int32_t totLen = aString.Length();
-  for (int32_t i = totLen - 1; i >= 0; i--) {
-    char16_t c = aString[i];
-    if (IsLineFeedCarriageReturnBlankOrTab(c)) {
-      continue;
-    }
-    if (kNBSP == c) {
-      aString.Replace(i, 1, ' ');
-    } else {
-      break;
-    }
-  }
 }
 
 void nsPlainTextSerializer::ConvertToLinesAndOutput(const nsAString& aString) {