Compile fix for wxDataFormat cast,

Unfinished code for wxDragCopy vs. wxDragMove,
  Corrected key accel code for wxFrame as children of wxFrame.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4139 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dobjcmn.cpp

@@ -97,7 +97,11 @@ wxDataObjectComposite::GetPreferredFormat(Direction WXUNUSED(dir)) const
 {
     wxSimpleDataObjectList::Node *node = m_dataObjects.Item( m_preferred );
 
+#ifdef __WXGTK__
+    wxCHECK_MSG( node, wxDataFormat(wxDF_INVALID), wxT("no preferred format") );
+#else
     wxCHECK_MSG( node, wxDataFormat((unsigned short) wxDF_INVALID), wxT("no preferred format") );
+#endif
 
     wxDataObjectSimple* dataObj = node->GetData();