Sure, I was not precise. So I meant, can you tell from a DAVdroid version if the packaged ical4android lib contains the addressed fix? I think, if an arbitrary person distributes DAVdroid via f-droid, it could also be shipped with an older version of ical4android, right?
No, the used commit IDs of the submodules are stored in the DAVdroid repository. This way, correct library versions will always be used.
BTW, do you provide an apk?
Only in the commercial stores.