[MERGE] Nested trees: CompositeTree

[Aaron Bentley]

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Ian Clatworthy wrote:
> Aaron Bentley wrote:
>> your comments have drawn me to re-evaluate the caching
> 
> Sure. I assume you're including the id_tree_branch map in that?
> (The responsibility/ownership of that seemed divided between
> NestedTree and _CompositeInventory which surprised me a little fwiw.)

Actually, I wasn't.  But I will now.

Aaron
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