I have a working patch for this bug. It depends on the fix for Bug #166254 being checked in first, though. It sorts by Received when possible, otherwise by Date. I'll post it when Bug #166254 has been fixed.
By the way, it only jumps to 'order received' if you click the thread column button. If you sort by Date, then choose 'View | Sort by | Threaded', it still sorts by date.
I have a working patch for this bug. It depends on the fix for Bug #166254 being checked in first, though. It sorts by Received when possible, otherwise by Date. I'll post it when Bug #166254 has been fixed.
By the way, it only jumps to 'order received' if you click the thread column button. If you sort by Date, then choose 'View | Sort by | Threaded', it still sorts by date.