Lightweight copy

[Guido Ostkamp]

>> This certainly means that Mercurial does not use lightweight copies.
>
> When you copy a file, a new revlog is created with the new filename 
> containing a single compressed revision of the file. If the old file 
> only had one revision, then yes, the size will double. If the old file 
> had a thousand revisions, it will not.

>From what you said I understand that you already have a backpointer for 
the thousand revisions.

Would it be theoretically possible to omit the single compressed revision 
of the file and just add a hint on where to find or how to generate it, if 
there is just one unchanged revision resulting from the copy?

This would help to save disk space.

Regards

Guido