MUC, direct chat: chat history uses room name and not user name
If two users in a MUC communitcate directly with each other (eg email@example.com/user1 and firstname.lastname@example.org/user2) Spark will display "user1: message" which is fine.
If user2 closes the "direct" connection window and reestablishes it then Spark will display the history in grey color, which is also fine but it will display "room: message" which looks weird.
This was fixed in another Issue
Addition: all private chat history is saved in one place. If you talk with different users in private chat in MUC, when it always opens the same recent history.
Can't test this currently as Spark is not saving such history at all.