Hi Andrey,
>Now "stg pull" no more accepts branch name; but I cannot figure how to to the >same using git config.
(I must say I am not sure to understand the workflow you're using, I suspect there were some missing steps in your mail).
You probably want "stg rebase <parent branch>", unless you have commits below your stack base, and that you get a merge commit when running "git pull".
In the latter case, there is possibly a missing feature: you can get a merge through git-pull, but you cannot pass the refspec any more. If there is a use for this (other than the one already handled by "rebase"), I'd like to understand the need, so we can add the feature back in a better way.
Best regards,
-- Yann.