Bazaar cannot commit and complains about missing file id

[Nicholas Allen]

It's actually very easy to reproduce. For example, the following 
commands reproduce the problem every time for me:

mkdir test
cd test
bzr init .
mkdir dir
cd dir
echo hello > hello.txt
cd ..
bzr add
bzr commit -m "Added file"
mv dir new_dir
bzr add --no-recurse new_dir
bzr mv dir/hello.txt new_dir/hello.txt
bzr commit -m "Moved dir to new_dir"

Once in this state you cannot revert or commit - I have also tested with 
latest bzr.dev...

I'm pretty sure this used to work in older versions of bzr as renaming a 
package is something I do occasionally and I never encountered this 
problem before.

Nick