[RFC] branching into existing directory fails

[Alexander Belchenko]

See https://bugs.launchpad.net/qbzr/+bug/307554

I'd like to get some comments from core bzr.devs because this bug 
affects qbzr plugin (because qbzr launches native bzr commands under the 
hood). QBzr is used in Bazaar Explorer GUI, and the more I'm using bzre 
the more I like it. But such bugs just create bad expression about all 3 
programs.

It seems it could be relatively easy fix, and I'd like to see it fixed 
in 1.17. How can I fix it?