[RFC] Dropping CommitBuilder supply-root compatibility thunk

[Aaron Bentley]

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Robert Collins wrote:
> Currently if a root is not supplied to commitbuilder, it is a
> deprecation warning, I'd like to make it into an error.

Makes sense to me.  I'm not sure there are *any* other clients of this
API, much less un-updated ones.

> This will allow returning inventory delta entries from
> record_entry_contents, and feed them into the
> update_to_one_parent_via_delta api I posted last night, as well as the
> commit reporter, saving duplicated diff-logic that currently exists.

I don't see why keeping it the way it is would prevent that, but it
certainly sounds like the right direction to me.

Aaron
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