Calendar: keep the reminders (VALARM) of an invitation when accepting it

[fvale]

When I accept a calendar invitation received by email (iTIP REQUEST), Thunderbird removes all the reminders (VALARM) from the event and only adds my single default reminder. The sender's reminders are lost.

Our organisation sends invitations with several reminders (for example 15 minutes, 24 hours and 4 days before). In Thunderbird all of them are dropped; in other calendar clients they are kept.

Related: Bugzilla 1379057 (reminders ignored on accepted invitations) and the idea "Thunderbird: multiple default reminders", so even the workaround of setting several default reminders is not possible today.

Proposal, any of these would solve it:
1. Keep the VALARMs of the invitation when the user accepts it (or add a preference to do so).
2. Allow several default reminders per calendar.

Thank you.

[kelimuttu]

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