When is a signal a "keybinding" signal?

[murrayc t-online de (Murray Cumming)]

In gtkmm 2.4, we don't want to wrap "keybinding" signals, because
apparently we're not suppose to and we were caught out when GTK+ 2.2
changed the API of some of those signals.

So I'd like to know what signals are "keybinding" signals. I thought I
could just check for uses of gtk_binding_entry_add_signal(), but that's
used on GtkEntry's "activate" signal, and I'm told that that's not a
keybinding signal.

-- 
Murray Cumming
murray usa net
www.murrayc.com