129122: add a new serializer mode (used primarily by mail) in which

<br> tags within <pre> blocks are translated to newlines.
  r=nhotta,ducarroz,tmutreja sr=sspitzer


git-svn-id: svn://10.0.0.236/trunk@118645 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/base/src/nsHTMLContentSerializer.cpp

@@ -427,6 +427,13 @@ nsHTMLContentSerializer::AppendElementStart(nsIDOMElement *aElement,
   nsCOMPtr<nsIAtom> name;
   content->GetTag(*getter_AddRefs(name));
 
+  if (name.get() == nsHTMLAtoms::br && mPreLevel > 0
+      && (mFlags & nsIDocumentEncoder::OutputNoFormattingInPre)) {
+    AppendToString(mLineBreak, aStr);
+    mColPos = 0;
+    return NS_OK;
+  }
+
   if (name.get() == nsHTMLAtoms::body) {
     mInBody = PR_TRUE;
   }