branchcache: skip entries that are topological heads in the on disk file In the majority of cases, topological heads are also branch heads. We have efficient way to get the topological heads and efficient way to retrieve their branch information. So there is little value in putting them in the branch cache file explicitly. On the contrary, writing them explicitly tend to create very large cache file that are inefficient to read and update. So the branch cache v3 format is no longer including them. This changeset focus on the format aspect and have no focus on the performance aspect. We will cover that later.

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Issue351: mq: qrefresh can create extra revlog entry

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  $ echo "[extensions]" >> $HGRCPATH

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  $ echo "mq=" >> $HGRCPATH

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  $ hg init repo

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  $ cd repo

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  $ hg qinit

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  $ echo b > b

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  $ hg ci -A -m foo

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  adding b

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  $ echo cc > b

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  $ hg qnew -f foo.diff

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  $ echo b > b

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  $ hg qrefresh

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  $ hg debugindex b

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     rev linkrev       nodeid    p1-nodeid    p2-nodeid

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       0       0 1e88685f5dde 000000000000 000000000000

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