stablebranch: avoid overlap between subrange
Subrange overlap make things more complicated and less efficient. We fix the
computation done in the "cached" version of the stablerange cache. This bring
things in line with the result produced by the basic version.
Since we already bumped the format version since the last release, I don't
things we need to do anything else.
#require test-repo
$ checkflake8() {
> if ! (which flake8 > /dev/null); then
> echo skipped: missing tool: flake8;
> exit 80;
> fi;
> };
$ checkflake8
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run flake8 if it exists; if it doesn't, then just skip
$ hg files -0 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs -0 flake8