Creating "AUDIO" VALARM notification actions causes endless problems:
users may only hear a sound notification (with no visuals), if at all,
and most other apps don't honor nor support editing audio-only alarms.
Other systems typically play a sound automatically on "DISPLAY" alarms.
https://datatracker.ietf.org/doc/html/rfc5545#section-3.6.6 says:
> Multiple mutually independent "VALARM" calendar components
> can be specified for a single "VEVENT" or "VTODO" calendar component.
However, each component states:
> 'action' and 'trigger' are both REQUIRED,
> but MUST NOT occur more than once.
To keep the UI simple, we should pick one or the other; "DISPLAY" it is.
Remove "AUDIO" alarm code and add a warning to never add it again.
Fixes: https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/1280
Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/680>
When the alarm sound changes, the change is not updated because
gcal-manager does not see the changes.
We now update the components and make more comparisons so that
it can be seen by gcal-manager
Jean-François Fortin Tam