[MERGE] support updating lightweight checkouts of readonly branches

[Robert Collins]

On Wed, 2006-10-18 at 07:59 -0400, Aaron Bentley wrote:
> 
> 
> Are you counting branch.update as a tree operation? 

Essentially yes, because when branch.update pivots, it returns the old
tip, and that must be immediately saving into the tree parents list, or
the users local commits are lost.

Perhaps theres another way to address it?

-Rob
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