libxfce4ui user repo for gtk3

[Simon Steinbeiss]

Actually the current Gtk2 panel supports Gtk3 plugins and the Gtk3 branch
of the panel supports Gtk2 plugins. This is a meaningful measure to ensure
users don't have to forgo lots of plugins or goodies that have no
maintainer.

Personally I don't see the overhead you're mentioning – distros will likely
install Gtk2 by default for quite a while longer. Furthermore it's up to
packagers to split the lib into two packages if they really don't want the
Gtk2 parts, if that's really something packagers and distro maintainers
want we can make a Gtk3-only compile option.
Finally, as you've seen it's not very hard to kick out the Gtk2-only parts,
so if we really decide to go down that road we can decide briefly before
the 4.14 release, from which we're still quite far away.

Cheers
Simon
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