nested trees design-approach : composite trees vs iter_changes

[Robert Collins]

On Wed, 2009-05-06 at 18:48 +1000, Ian Clatworthy wrote:
> We had that 2 months back and had to
> stop --development-rich-root from supporting subtrees because it was a
> performance regression that couldn't easily be fixed.

This is tightly related to the issue of whether we examine subtrees as
we encounter them or in a separate phase : the difficulty relates to
that conceptual question much more than actually writing the code, I
think.

-Rob
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