bootstrap_inline filter does not work with Bootstrap 2

[martey]

I am trying to use the bootstrap_inline filter with Bootstrap 2.3.1 and a formset. I suspect that it is not working because of twbs/bootstrap@f662dff and the changes that @Nivl made to bootstrapform/templates/bootstrapform/field.html. The forms' fields display inline correctly if I move them out of the "form-group" divs.

Since the filter is not documented, it is not clear whether it only works with BS3 by design or this is just a bug.