feature request: ICS Calendar Subscription

[theknigge]

Enable users to subscribe to external calendars via ICS links. This will allow seamless integration and automatic syncing of events from third-party sources directly into their personal calendar.

[mschering]

Good news! This will be implemented in 6.9.

[lonesomewalker]

For this i suggest to have some checks for clean calendars, because as i have seen now in several ones: not all programs deliver valid ics files. And as i have seen it with ICSx5, they simply use an existing Java library which is VERY strict in parsing content. On the one side it breaks every time a sh*tty ics is inserted, on the other it is very good for debugging/removing non-conformant appointments :-D