[issue1923] Improve performance of --similarity 100

[William Roberts]

New submission from William Roberts <williamr at symbian.org>:

Could the "hg addremove --similarity 100" performance be improved by noting
that the checksums of the two files must be identical for 100% similarity,
and so there's no need to extract the file content and compare. It's a
special case optimisation, but "identical" is surely the main use of this
feature?

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messages: 11051
nosy: WilliamRoberts_hg
priority: wish
status: unread
title: Improve performance of --similarity 100

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