Fixes to wxMotif scrolling and colours (wxTreeCtrl/wxListCtrl now seem to work

well, ta-ra!); fixes to thread.cpp since constants were changed


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1275 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/string.h

@@ -73,6 +73,8 @@
  */
 // ---------------------------------------------------------------------------
 
+WXDLLEXPORT_DATA(extern const char*) wxEmptyString;
+
 /// checks whether the passed in pointer is NULL and if the string is empty
 inline bool WXDLLEXPORT IsEmpty(const char *p) { return !p || !*p; }