[MERGE] move smart_add_tree to MutableTree, tested on WorkingTree..

[Robert Collins]

On Tue, 2007-07-03 at 21:56 -0400, Aaron Bentley wrote:
> 
> The interactions between inventory and dirstate mean that we have to
> periodically sync them.  When we do that, doesn't it potentially hit
> disk?

Not at present, and tests would fail if it did. It currently only ever
writes when the tree is just about to be fully unlocked.

> My feeling was that ability to change the inventory without writing it
> to disk, and without intending to ever write it to disk was an
> unintentional feature, and not something to rely on.

We used to have add code that simulated adding the files, but it was
considerably more complicated. I think if we can keeping the current
constraint of allowing a revert-to-disk facility is better.

Rob

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