Allow other calendar apps

We want to be able to use other calendar apps transparently.

Few options tried don't work. Removing permissions has the default calendar still running and complaining about permissions frequently.

Keeping the default calendar but disabling sync in it, seems to completely disable the providers, because the other calendar apps no longer can get new data from the servers.

problem is an extra notification from the default calendar application that is also called Etar because it’s a fork.

Not only that, but the calendar app seems to be managing the calendar providers too, because if i turn off sync in the calendar, fossify calendar no longer gets new data from the servers.

It’s supposed to be a 3 part system where there is a sync service the calendar provider and the calendar client.

Either the app is left running as a manager of the provider but we can manage notifications ( to stop default calendar notifications) or the app is decoupled from the provider so that we can manage the app access to data without preventing other apps from doing it.

https://community.e.foundation/t/turn-off-notifications-for-the-default-calendar-app/66275