It seems that your patch is different from mine:

Your:

-    if ( m_wiki.contains( "charset=utf-8"  ) ) {
+    if ( m_wiki.contains( "charset=utf-8", FALSE ) ) {

Mine:

-    if ( m_wiki.contains( "charset=utf-8"  ) ) {
+    if ( m_wiki.contains( "charset=UTF-8"  ) ) {

The encoding string should be in capital letters...