when filing on case, original activity not retained
In previous versions, when an activity was filed to a case, the activity remained on the contact record with the text "Filed on case..." prepended to the subject. That changed with this commit: https://github.com/civicrm/civicrm-core/commit/9a30d940eee1d62e57d1a5db7a8651b46cc7a674
The activity still has the text prepended to the subject, but because the activity is marked as not a current revision, it doesn't appear on the contact record's activity listing.
I think the activity should be marked as not a current revision if the activity is moved, but not if filed on a case. Looking for feedback on the concept before I file a PR. @mattwire can you chime in, as that was your PR.