- New gimp_action_get_display_accels() added to GimpAction API to get directly
the human-visible strings for actions.
- Also adding an "accels-changed" signal to GimpAction. As far as I can see,
even though accelerators are now to be set on the GtkApplication, there seems
to be no signals or properties to connect to at all on this class. So instead,
let's do it on our GimpAction (which means we must absolutely not use
gtk_application_set_accels_for_action()).
- GimpAccelLabel now uses the proper GimpAction API instead of accelerator
closure which is a disappearing concept.
Add a new GimpAccelLabel widget, which shows an accelerator label
for a given GimpAction. Unlike GtkAccelLabel, GimpAccelLabel
doesn't show a user-provided label in addition to that.
Note that the size request of GtkAccelLabel doesn't include the
accelerator part, which is desirable in some contexts.
GimpAccelLabel doesn't suffer from that.
