changing label invalidates best size

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@52973 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/stattext.cpp

@@ -124,7 +124,10 @@ void wxStaticText::SetLabel( const wxString &label )
 
     // adjust the label size to the new label unless disabled
     if ( !HasFlag(wxST_NO_AUTORESIZE) )
+    {
+        InvalidateBestSize();
         SetSize( GetBestSize() );
+    }
 }
 
 bool wxStaticText::SetFont( const wxFont &font )