From the maintainer, on BZ#1737929:
We're looking to deprecate
it was used in the old
gtk2 [Sugar] Activities, there's a few more to migrate to the gtk3.
There's overall been a multi year effort to move to python3 including
moving from gstreamer 0.10 python bindings to py3 friendly
introspection based gst 1.0 bindings etc.
There's only a handful of gtk2 based Activities left
repoquery --whatrequires sugar-toolkit)