thunderbird/lightning not sending calendar notifications

[zyro23]

Steps to reproduce

1. disable caldav server-side email sending in the admin ui (new option added with 13.0)
2. use thunderbird/lightning to create an appointment and add a participant
3. in the participants tab, the "notify participants" checkbox is greyed out and no notification is sent

Expected behaviour

checkbox should be enabled and if checked (default), thunderbird/lighnting should ask if i want to send the notification after saving the appointment.

Actual behaviour

checkbox disabled and thunderbird/lighnting does not ask if i want to send a notification and no notification is sent.

Server configuration

nextcloud-13.0.0 docker image

Workaround

i was able to make this work again by commenting out the schedule plugin manually, but @georgehrke mentioned this may lead to undesired side effects, see. b958725#r27649001

[myset]

Enhancement proposal

I propose you to introduce per-calendar option (checkbox) for remote client based invites or cancellation notifications (Ex. External client notification).

[georgehrke]

@myset That won't be possible. The property that tells thunderbird that the server sends out emails (or not) is valid for the entire CalDAV server and not applicable to individual calendars.

[myset]

Considering this behavior, It is possible to create an instance of CalDAV at the level of user calendar to be applicable at the level of each user calendar ?

[dugite-code]

In a recent update I had to comment out $this->server->addPlugin(new \OCA\DAV\CalDAV\Schedule\Plugin()); in /var/www/nextcloud/apps/dav/lib/Server.php as well in order to allow thunderbird to send invites

[myset]

Doesn't work for me with Thunderbird 52.8. No invites emails are sent.

[dugite-code]

@myset I had to unsubscribe and re-subscribe the calendar for Thunderbird (52.8) to recognise the change

[myset]

Yes. It works with unsubscribe and subscribe in Thunderbird.
But ... not confortable because after each NextCloud update is necessary to repeat all workarounds: comment line on server and unsubscribe and subscribe in each Thunderbird.
P.S.
That's because of sharing the same calendars across multiple computers/devices

[myset]

I propose you to introduce an option (checkbox) at the level of servers settings (Ex. External client notification) in order to maintain /var/www/nextcloud/apps/dav/lib/Server.php "commented line behavior" across NexcloudServer updates.

[MorrisJobke]

@georgehrke Haven't you worked on this recently?

[georgehrke]

It seems like Thunderbird sometimes checks if the schedule plugin is enabled.
So I guess we should change the option from disable email sending to disable any server side scheduling, but we also have to properly communicate the consequences like no Free/Busy, etc.