Highlight does not change when room list is re-sorted after a new message arrives

0. Use the setting for intermixed rooms
1. Join multiple rooms
2. Read all messages in all rooms
3. Go to the room at the top of the sidebar
4. Someone sends a message to a different room

The sidebar item for the room that just got a message moves to the top, but the highlight effect does not change, so the sidebar incorrectly indicates that you are viewing the chat that got the new messages, not the chat you're actually in.

In the above screenshot, the highlight effect should have remained on "Fedora KDE", rather than moving to "KDE Chat" after it received a message.