(fix) fallback to utf-8/latin1 in rare decoding error cases - this is ugly

UI/MailPartViewers/UIxMailPartHTMLViewer.m

@@ -872,6 +872,19 @@ static NSData* _sanitizeContent(NSData *theData)
 		    usingEncodingNamed: [[bodyInfo objectForKey:@"parameterList"]
 					  objectForKey: @"charset"]];
 
+      // In some rare cases (like #3276), we can get utterly broken email messages where
+      // HTML parts are wrongly encoded. We try to fall back to UTF-8 if that happens and
+      // if it still happens, we fall back to ISO-Latin-1.
+      if (!s)
+        {
+          s = [[NSString alloc] initWithData: preparsedContent  encoding: NSUTF8StringEncoding];
+
+          if (!s)
+            s = [[NSString alloc] initWithData: preparsedContent  encoding: NSISOLatin1StringEncoding];
+
+          AUTORELEASE(s);
+        }
+
 #if BYTE_ORDER == BIG_ENDIAN
       preparsedContent = [s dataUsingEncoding: NSUTF16BigEndianStringEncoding];
       enc = XML_CHAR_ENCODING_UTF16BE;