PQM silent branch lossage

[Barry Warsaw]

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Hi Robert and friends,

As you know, we rely on PQM for Launchpad development, and for a while  
now it's been the case that branches can get silently dropped.   
There's a lot of speculation about why this happens, and there's this  
open bug on PQM:

https://bugs.edge.launchpad.net/pqm/+bug/246660
Silently drops branches in unknown formats

I've heard rumors that PQM can also silently drop branches due to  
autopacking bugs, but I really don't know much about the details of  
this.  I'm sure there is more than one reason for silent branch loss.

The purpose of this thread is to try to gather all known information  
about why branches get silently dropped.  Ideally, this should never  
happen, and the submitter should always get a success or failure  
message.

If you know (or think you know) a reason for merges getting silently  
dropped, please follow up to this message.  I'll be happy to submit  
bug reports for known issues, if you don't beat me to it.

Thanks,
- -Barry

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