message display issue

[Jack <ostroffjh sbcglobal net>]

I think I've actually noticed this issue for some time, but it finally  
got annoying enough for me to ask for help.

If I am in a mailbox with lots of messages (I have some with almost  
1000 messages) I often use the "Subject or Sender Contains:" search  
function.  However, if I do such a search and select a message, and  
then empty the search box and hit the reset button to the right of the  
box, I am often switched to a different message, although sometimes  
left on the same message.  I cannot think of any reason NOT to be left  
displaying the same message.  (If I change the value in the search box,  
and the selected message is no longer included in the list of displayed  
messages, I can imagine "unselecting" that message.)  Is this a bug, or  
am I missing something that would explain it.  (As far as I know, this  
happens in both mbox and maildir mailboxes, but I'll have to confirm to  
be absolutely certain.)

Thanks for any suggestions of relevant info.

Jack