[Django] #35035: BaseFormSet should try to use provided Form's default_renderer before defaulting to get_default_renderer()

[Django]

#35035: BaseFormSet should try to use provided Form's default_renderer before
defaulting to get_default_renderer()
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Reporter: Christophe Henry | Owner: nobody
Type: Bug | Status: new
Component: Uncategorized | Version: 4.2
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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When creating a `BaseFormSet` using a subclass `Form` that defines
`default_renderer` to a custom, it's a bit disturbing that the
`BaseFormSet` does not try to use this renderer before defaulting to
`get_default_renderer()`. This requires the user to always explicitely
specify the renderer when subclassing `BaseFormSet` or using
`formset_factory`, which is error prone.

I propose the following: when instanciating a `BaseFormSet`, if
`self.renderer` is `None`, instanciate an empty form with
`self.empty_form` (the form's `default_renderer` may be a property) to get
the form's `default_renderer`. If this one is `None`, default to
`get_default_renderer()`.

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Ticket URL: <https://code.djangoproject.com/ticket/35035>
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