Is Overriding widget templates buggy?

[run_the_race]

I was going to report a bug, but the guide recommends asking here first.

While trying to override a built in widget template (still stuck on it here: https://forum.djangoproject.com/t/overriding-widgets-templates-not-working-following-help-template-loader-not-searching-app-dirs/12974),  I came across this weird behavoir:

In `django/forms/renderers.py` line 59 it has:
```
class TemplatesSetting(BaseRenderer):
    """
    Load templates using template.loader.get_template() which is configured
    based on settings.TEMPLATES.
    """
    def get_template(self, template_name):
        return get_template(template_name)
```
However a new project with:
```
TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
    {
        'BACKEND': 'django.forms.renderers.TemplatesSetting',
        'DIRS': ['/my/overide/dir/path',],
        'APP_DIRS': False,
    },
]
```

Generates the error:
```

Traceback (most recent call last):
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/template/utils.py", line 66, in __getitem__
    return self._engines[alias]
KeyError: 'renderers'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/michael/project/src/manage.py", line 16, in <module>
    execute_from_command_line(sys.argv)
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/core/management/__init__.py", line 425, in execute_from_command_line
    utility.execute()
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/core/management/__init__.py", line 419, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/core/management/base.py", line 373, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/core/management/base.py", line 417, in execute
    output = self.handle(*args, **options)
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/core/management/commands/check.py", line 63, in handle
    self.check(
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/core/management/base.py", line 438, in check
    all_issues = checks.run_checks(
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/core/checks/registry.py", line 77, in run_checks
    new_errors = check(app_configs=app_configs, databases=databases)
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/contrib/admin/checks.py", line 78, in check_dependencies
    for engine in engines.all():
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/template/utils.py", line 90, in all
    return [self[alias] for alias in self]
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/template/utils.py", line 90, in <listcomp>
    return [self[alias] for alias in self]
  File "/home/michael/.venv/project/lib/python3.8/site-packages/django/template/utils.py", line 81, in __getitem__
    engine = engine_cls(params)
TypeError: TemplatesSetting() takes no arguments
```

How does one configure `django.forms.renderers.TemplatesSetting` without it throwing an error?

[Antonis Christofides]

Hi,

I'm not really an expert in that part. From what I can read in the documentation, TemplatesSetting isn't a template backend, so why do you think you can specify it in TEMPLATES[x]['BACKEND']? It appears to be a form renderer, which means you can specify it in FORM_RENDERER.

But of course I may have understood something wrong myself.

Regards,

Antonis

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