🚀 go-pugleaf

I just stumbled on what may be a flaw in the Mail.app that resulted in the  
loss of more than 100 message attachments.
I am not completely sure of what caused this but my guess is as follows: 

1. I selected a slew of messages and started a Transfer from Active.mbox  
to another.mbox.

2. When Mail.app appeared to be finished (i.e., cursor no longer spinning  
and Mail.app takes commands), I went back to Active.mbox and did a Compact  
operation so that I would not have duplicate attachments taking up many  
megabytes.

3. When the compact operation completes, what I find is that almost all  
the messages in Another.mbox are missing their attachments (including  
index.rtf files, etc.).

4. I presume that what happened is that Mail.app gave control back to the  
me (i.e. pretended to be finished) when it completed the mbox transfer and  
it then began to move the attachments in the background. In the meantime,  
I went back to Active.mbox and did a compact which does a remove of all  
the attachments for the messages that have been moved. The remove  
operation competed with the move operation and, of course, the removes won  
thus resulting in a whole lot of lost mail.