topics: pass 'topics' to ui.formatter instead of 'bookmarks'

topic: also insert the extra head check with using the new head checking This will get the protection in place in all cases.

topic: some document for an obscure function

topic: adjust head checking wrapping to not interfere with concurrent push In the previous form, the new topic head was detected as affected and the push was rejected. We introduce a of 'test-topic-push.t' using the new race checker as there have been many compatibility issue with this new checkers.

topic: also detect head checking using the concurrent part

test: avoid 'test-check-commit.t' complaining copied code We switch to git diff.

topic: small test cleanuo The section was repeated.

topic: move the heads data to the branch line when appropriates The topic line is dropped as it is quite confusing.

topic: add some initial support for using stack on named branch Stack is a useful command that can make sense in other context. The current support is hacky and awful, but we have something!

topic: explicitly pass topic as a keyword argument This clarify all callers before adding more logic related to bare branch in stack.