[MERGE] Enable merging PreviewTrees

Robert Collins robertc at robertcollins.net
Thu Oct 9 07:47:30 BST 2008

On Thu, 2008-10-09 at 00:02 -0400, Aaron Bentley wrote:
> Inventory objects are meant to be an implementation detail of certain
> Tree types.  Hitting the inventory is expensive on DirState-based
> trees,
> and we've worked hard to eliminate .inventory access from our key
> codepaths.  PreviewTree is the next step, because it eliminates the
> .inventory attribute entirely.

I've replied to the prior thread about this patch, but let me note that
we can write a more lazy inventory for dirstate - inventory supports
lookups by name (the path2id method would seed loading the data via
bisection, then foo[id] would succeed).

GPG key available at: <http://www.robertcollins.net/keys.txt>.
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