Re: 'git branch' when origin branch with same name exists

> Requiring starting point and failing without --force will never
> happen, but it could be a possible approach to issue an additional
> advice message under reasonably narrow conditions, namely:
>
>  - The starting point was not given explicitly;
>
>  - It would have DWIMed to "git checkout -t -b it origin/it" when
>    creating the branch (I think you need to check configurations
>    like branch.autosetupmerge and existence of the tracking branch
>    remotes/origin/it); and
>
>  - advice.branchNotTrackingCorrespondingRemote is not set to false.