As far as I know, glade is only an optional dependency for
libxfce4ui. I
believe we can drop it.
Please correct me if I am wrong.
After my recent foray in xfwm4 I believe that this is not needed if
you build from a release (make dist) archive. However, if you patch a
glade file, you need this package to rebuild the patched UIs. See my
xfwm4 thread, I learned it the hard way when I tried to set up my copr
repository (which is ready for testing by the way).
If no one is taking it, I volunteer. Depending on the upstream
reception of my patch I may spend more time hacking Xfce. I have at
least noticed a few opportunities for cosmetic enhancements in the
xfwm4 code base.
Dridi