Expected revision inaccurate with Filter::map

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It seems Filter::map doesn't relect the <<delete>> revisions, so the
dest driver can finish with the progress bar not finished.

Overriding rev_count() doesn't look appropriate as ::map itself
doesn't know how many revisions will be deleted at that time.  Maybe
it should call pr_doing when deleted, but it obstructuring the
layering, and doesn't reflect the real revisions to be written either.

Suggestions?

Cheers,
CLK

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