WorkingTree.revert bug

[Aaron Bentley]

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Gustavo Niemeyer wrote:
> Hey Martin!
> 
> How're things going?
> 
> Do you remember when I asked you to have a look at something
> strange that was happening with svn2bzr at UBZ, regarding a
> working tree with an empty inventory, even though the real
> tree had files?  I've spotted the issue.  The attached file
> explores the bug.
> 
> Basically what happens is that revert is a dummy method calling
> an external function to do the real job, so it should reread the
> inventory after merge_inner returns.

What's really unfortunate is that
working_tree.branch.working_tree().set_inventory() has no effect on
working_tree._inventory, especially given that we've taken out a write lock.

Aaron
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