[brisbane-core MERGE] CHKInventory.iter_non_root_entries()

[Aaron Bentley]

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Ian Clatworthy wrote:
> It seems that operations that walk directories in CHKInventories
> are slow, e.g. directories() and iter_changes(). As it turns out
> though, I don't *need* the path returned by iter_changes() in
> fast-import - just the inventories entries while loading texts.

Okay, but why skip the root entry?  Aren't we trying to stop treating
the root entry as special?

Aaron
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