[gtkmm] Gtk::Style::paint_layout() patch needed

["Andrew E. Makeev" <andrew solvo ru>]

Hi,

I've noticed, that CellRendererText render function now is getting 
Gdk::Drawable instead of Gtk::Window.
Also, GTK+ chaged gtk_pain_layout GdkWindow parameter to GdkDrawable, 
but GTKMM! Now, I can't create custom cellrenderer from scrap to draw 
just a text.
All that we need is the patch for style.h and style.cc paint_layout 
method to accept Glib::RefPtr<Gdk::Drawable>.

Also, I would notice that adding const to get_size_vfunc() in 
Cellrenderer just removed all advantages I could use to speed up 
treeview and get custom cells rendered properly. Could that be chaged 
back, please? Yes, I saw some mails about that before, but met that 
problem only now, sorry. So, what will be answer?

Regards,
-andrew

PS
If you like, I could submit a patch just tomorrow