@enr00ted Maybe other apps use other CalDAV methods (for instance, only PROPFIND instead of the better-suited REPORT calendar-query). If these clients are open-source, you can have a look at the source code – would be interesting.
DAVx⁵ 2.4 Release Notes
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Version 2.4
- completely rewrite UI architecture (use ViewModel instead of Loaders)
- improve robustness and responsiveness, especially when there are a lot of collections
- improve UI to make it more Material (for instance, use progress bars instead of deprecated progress dialogs)
- improve read-only contact behavior (contacts from read-only address books are now marked as read-only; in most Contact apps, you can still edit those contacts, but the changes will not persist)
- notify on invalid events, too (since 2.3, invalid tasks/vCards cause notifications)
- library and translation updates
- other improvements and bug fixes
- completely rewrite UI architecture (use ViewModel instead of Loaders)
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Version 2.4.0.1
Hotfix: AccountActivity: avoid endless loop of asking for permissions; version bump to 2.4.0.1