The old ui.glade was still being referenced by the list of translatable
files. The corresponding files from the GTK3 version were missing.
automake doesn't seem to handle conditional _DATA files correctly. In contrast
to source files, they end up not being distributed when disabled. To solve
this, src/gtk*-ui/gtk-ui.am must be included unconditionally in src.am and
contain unconditional EXTRA_DIST entries for the two ui.xml files.
We want to support both GTK+-2.0 and GTK+-3.0 for the time being
(even if the former is just maintenance). This is not possible in
the same codebase without large amounts of ifdefs so we fork the UI.
Jonas Smedegaard
Patrick Ohly
Jussi Kukkonen