[sylpheed:33741] 3.0.0 current message changed after execute

[Rich Coe]

Hi Hiroyuki-san,

I have a folder that had over 2000 unread messages in it, of about 2500 total.
After deleting about 1000 messages, I clicked execute, and the current message
was moved to an unread message in the middle of the unread messages.
    36 new, 1195 unread, 1396 total

Sylpheed v3.0.0rc

This might have something to do with the folder being mis-sorted after 
the delete.  I also noticed some of the messages were not correctly sorted
according to the tree structure.

Rich
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