[RFC] Allow KnitVersionedFile to track a cached text

[Robert Collins]

On Fri, 2007-01-19 at 16:19 -0600, John Arbash Meinel wrote:
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> The attached patch changes KnitVersionedFile so that it has the
> possibility to cache the last text inserted. The idea is that when doing
> a bulk conversion you can set this flag and it will cache the last
> inserted text in memory, rather than having to extract it by applying a
...

Dont we have that already? The return value of insertion is an opaque
structure that can be used on the next insertion to avoid internal
overhead.

-Rob
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