next: prompt user to choose a children in case of ambiguity This patch adds functionality to prompt user and ask the children to which next should move to incase of multiple childrens. This is a very nice UI because otherwise user has to lookup changeset hash, and then manually do `hg update` to that. In this case we show hash and description so user can choose which one to update easily. It is using the interactive revision choosing functionality added in a previous patch.

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# utility to setup pythonpath to point into the tested repository

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export SRCDIR=`dirname $TESTDIR`

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if [ -n "$PYTHONPATH" ]; then

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    export HGTEST_ORIG_PYTHONPATH=$PYTHONPATH

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    export PYTHONPATH=$SRCDIR:$PYTHONPATH

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else

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    export PYTHONPATH=$SRCDIR

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fi