This doesn't work out. The problem is, that ``self.get_thumbnail_name`` can be overloaded by another class - in my case thats ``ThumbnailerNameMixin`` from https://github.com/stefanfoulis/django-filer/blob/develop/filer/utils/filer_easy_thumbnails.py. Unless I change that code too, I can't fix it on the easy-thumbnails side. Sure, splitting a just recombined filename again, is not the cleanest solution.
I will ask stefanfoulis about his opinion.