using "only" breaks form layout use of {% formconfig %}

[melinath]

{% formconfig %} only works in the context of a {% form %} tag. To know whether it's in such a context, it checks for the presence of a particular context variable (_form_render).

Unfortunately, if only is set on a {% form %} tag, the _form_render variable is not passed in (because it's set as part of the outer context rather than the inner context.)

I believe the solution would be as simple as setting _form_render in get_extra_context instead of in render.