Template widget rendering: "Add the renderer argument ..." false positive when using **kwargs

[Jon Dufresne]

I have a custom widget with the following method:

def render(self, *args, **kwargs):
    self.pre_render_setup(*args, **kwargs)
    try:
        super().render(*args, **kwargs)
    finally:
        self.post_render_cleanup(*args, **kwargs)

Starting with Django 1.11 every use of this widget spews the following warning:

.../venv/lib64/python3.5/site-packages/django/forms/boundfield.py:41: RemovedInDjango21Warning: Add the `renderer` argument to the render() method of <class '...'>. It will be mandatory in Django 2.1.

As I'm using **kwargs, the renderer value is correctly passed on to the render() function. This warning should be silenced.

[Jon Dufresne]

​PR

[Tim Graham <timograham@…>]

In 29a5180:

Fixed #28265 -- Prevented renderer warning on Widget.render() with kwargs.

[Tim Graham <timograham@…>]

In 1940e3d:

[1.11.x] Fixed #28265 -- Prevented renderer warning on Widget.render() with kwargs.

Backport of 29a518006f7f96186483fa50e249e1c3f21728d5 from master