Gtk::Entry#completion= should call G_CHILD_SET so that the completion
won’t be GC’d.
Is the addition of a G_CHILD_SET(self, rb_intern(“completion”),
completion); the correct way of doing this?
If so, can I apply a patch to Subversion?
(There are probably a lot more of these cases that need fixing. I’ll
try to go through them when I update all the other memory management
issues that I’ve seen.)