evolve: exclude "identical" precursors from the precursors set
I'm not sure it is the right thing to do, but it simply thing a lot for now.
Otherwise, using 'precursors' to find rewind direction become too complex.
This is going to give problematic result in case of prune. Since there are no
other precursors to follow.
#!/bin/bash
set -euox pipefail
unset GREP_OPTIONS
NOTOPIC="--config experimental.topic-mode=ignore"
compatbranches=`hg branches --quiet | grep 'mercurial-' | grep -v ':' | sort -n --reverse`
prev='stable'
for branch in $compatbranches; do
hg up $branch
hg merge $prev
hg commit -m "test-compat: merge $prev into $branch"
prev=$branch
done