Support Classification property of CalDAV events

[Max-F-Helm]

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Checklist

• [X] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [X] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [X] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [X] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the contribution guidelines.
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Feature description

I would like to suggest that you implement the editing of the Classification property for CalDAV synced events. The event-editor dialog should get a new dropdown to select the possible values.

Why do you want this feature?

Setting the classification for events in shared calendars can for some people a necessary feature to restrict the visibility of events while still show that one is busy at a given time.

Additional information

No response

[min7-i]

I'm also hoping that this will be added at some point. It's the main feature that's keeping me from using the app as my main calendar app.

If this feature is implemented, there might be a few additional topics that should at least be considered from my point of view (not necessarily implemented right away):

1. When it's possible to edit the classification for an event in the app, users will probably expect this property to be supported in exports and imports as well.
2. Highlight private/confidential events in certain views, e.g. adding a lock icon to the event in the daily view.

[MangoMango666]

I also hope this feature will soon be supported.