Description of Problem:
When deleting a message in a thread view (the one on the top of the
thread), selection doesn't go all the time to the second one. And some
times, threads get moved in another order

Steps to reproduce the problem:
1. Go to a folder with thread view enable and hidden deleted message option
2. Select sorting by subject (ascendant or descendant)
3. Delete some messages of the thread and selection will not be on the
right message

Actual Results:
selected message is not the right one

Expected Results:
I will expect that if I start on the top of all the threads and I hit DEL a
lot of times, messages will get deleted in the order I see.

How often does this happen? 
Everytime. If you want, I can take screenshot of all steps