Optimize TreeStore.AppendValues
Optimize TreeStore.AppendValues

Same as be7cfd49bb39efd89458bc2cb22b321685bed4fc
antoniusriha/gtk-sharp,antoniusriha/gtk-sharp,antoniusriha/gtk-sharp,sillsdev/gtk-sharp,sillsdev/gtk-sharp,antoniusriha/gtk-sharp,antoniusriha/gtk-sharp,sillsdev/gtk-sharp,sillsdev/gtk-sharp,sillsdev/gtk-sharp