changegroup: don't try to prune manifest nodes if not ellipses In non-ellipses case, the number of manifest nodes can be very big, and finding whether one of them can be pruned or not is very costly. For each node, we try to find the rev and the linkrev, which is expensive. Sending bit more manifest nodes seems better and much faster here. On our internal repository, this saves around 5 seconds on `hg tracked --addinclude <some_path>` on a narrow repo with ellipses disabled. Differential Revision: https://phab.mercurial-scm.org/D5782

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  $ hg init repo

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  $ cd repo

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  $ touch foo

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  $ hg ci -Am 'add foo'

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  adding foo

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  $ hg up -C null

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  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

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this should be stored as a delta against rev 0

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  $ echo foo bar baz > foo

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  $ hg ci -Am 'add foo again'

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  adding foo

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  created new head

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  $ hg debugindex foo

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     rev linkrev nodeid       p1           p2

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       0       0 b80de5d13875 000000000000 000000000000

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       1       1 0376abec49b8 000000000000 000000000000

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  $ cd ..