Collapsible admin fieldsets are not styled

[petrklus]

Django 5 and Django CMS 5:

Expectation (from CMS v3):

I am on djangocms-admin-style==3.3.1

[fsbraun]

@petrklus Unfortunately, there currently are few people actively using and maintaining djangocms-admin-style. Admin markup structures have changed quite a bit over the last versions of Django. I'd happily support any effort in updating djangocms-admin-style. So please be invited to submit pull requests.

Alternatively, you may take a look at djangocms-simple-admin-style. It is targeted to provide a django CMS-themed admin experience with a minimal CSS file (<20k) and intervention to Django's admin. Hence, I hope it provides a more compatible way to have a django CMS look-and-feel in the admin.

It will also support django CMS' new style coming with django CMS 5.1.

[petrklus]

Makes sense @fsbraun .

I think for the existing projects, the djangocms-admin-style seems to be pretty close to being there, so we will implement the changes to make it look respectable and submit a PR.