convertbookmark: properly convert stacked bookmarks
We ignores pure descendant when looking for revision to convert. This adds
support for cases were a linear stack contains multiple bookmark (or
un-bookmarked descendants exists).
In this case, some changeset are left orphan, but we'll consider the issue as
minor for now.
#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