In master, I have made some commits to replace the use of most
deprecated API. Hopefully things still work OK.
But there is still some use of GtkStyle (instead of GtkStyleContext)
that needs to be replaced. I couldn't see a way to copy a
GtkStyleContext, so I couldn't replace this code:
http://git.gnome.org/browse/libgda/tree/libgda-ui/data-entries/gdaui-entry-shell.c#n379