Unicode characters in event titles break moving events between calendars

[st3iny]

We ran into this bug and after figuring out how to reproduce, we tried NC 24.0.4rc1 with the merged fix. Unfortunately it didn't fix the error, we can still reproduce broken events by switching between calenders.

Edit: It seems this only happens if the title of the event in question has some unicode character or emoji. We can 100% reproduce it by using the white heavy check mark (U+2705 | \xE2\x9C\x85 | WHITE HEAVY CHECK MARK)

Originally posted by @kartoffelheinz in nextcloud/server#30120 (comment)

[st3iny]

Ref #3325

[berndschimmer]

As my previous post was marked as spam, I will write a little more. This issue is a really annoying. If you create a calendar item and add a ✅ to the title and than change the calendar, the item is gone and you have no suitable chance to get it back (data loss).

[tcitworld]

I can't reproduce this on server master and calendar main, can you @st3iny ?

[berndschimmer]

It seems that 24.0.4 (final) or 24.0.5 fixed it. All versions from 22. up to 24.0.4 are affected.

[st3iny]

Awesome! Please let us know if the error persists. I'll close the issue in the meantime.