Corrected a clearing bug

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42559 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/richtext/richtextxml.cpp

@@ -41,7 +41,7 @@ bool wxRichTextXMLHandler::DoLoadFile(wxRichTextBuffer *buffer, wxInputStream& s
     if (!stream.IsOk())
         return false;
 
-    buffer->Clear();
+    buffer->ResetAndClearCommands();
 
     wxXmlDocument* xmlDoc = new wxXmlDocument;
     bool success = true;