What's the deal with MemoryTree?

[Aaron Bentley]

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Justyn Butler wrote:
> Thanks for your help. I have been able to put something together using
> TransformPreview although it is a little hackish because I found that
> merging with PreviewTrees seems to produce erratic behaviour in
> multi-file trees.

Yes, it looks like a bug to me.  Unfortunately, I haven't been able to
determine the cause yet.

Aaron
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