prev: jump to parent's successor if parent is obsolete and topic is involved `hg stack` shows a linear chain of commits even when they are not linear chain and some changesets are obsoleted and have successors as separate head. This is very nice to have a post evolution view of the stack. However when `hg prev` is run on an unstable changeset whose parent is obsolete and does not topic but parents successor has the topic, it shows no parent on the topic. This patch makes `hg prev` update to parent's successor and make things follow the stack order.

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#require test-repo

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  $ checkcm() {

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  >   if ! (which check-manifest > /dev/null); then

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  >     echo skipped: missing tool: check-manifest;

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  >     exit 80;

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  >   fi;

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  > };

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  $ checkcm

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  $ cat << EOF >> $HGRCPATH

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  > [experimental]

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  > evolution=all

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  > EOF

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Run check manifest:

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  $ cd $TESTDIR/..

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  $ check-manifest

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  lists of files in version control and sdist match