Add support for wxDC_ROW_LINES for GTK+ and OS X

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50450 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/datavcmn.cpp

@@ -1693,6 +1693,11 @@ void wxDataViewTreeCtrl::OnCollapsed( wxDataViewEvent &event )
     GetStore()->ItemChanged( event.GetItem() );
 }
 
+void wxDataViewTreeCtrl::OnSize( wxSizeEvent &WXUNUSED(event) )
+{
+#if !defined(__WXGTK20__)
+#endif
+}
 
 #endif // wxUSE_DATAVIEWCTRL