bug#3228: 23.0.93; GTK font selection: asked for Courier, got Nimbus

[Chong Yidong]

Kenichi Handa <handa@m17n.org> writes:

> So, this problem can be solved by modifying x-select-font
> (called from menu-set-font) to return a font-spec (with a
> proper font-backend name in :type) instead of font-name.

I've now done this in the trunk for the GTK 3 case.  It's not
straightforward to do this for GTK 2, so I will not attempt that.