Qwidget setAutofill

The `setAutofill()` function is a method of the `QWidget` class in Qt. It is used to enable or disable the automatic filling of the widget's background with the widget's palette color. When the autofill feature is enabled, the widget's background will be painted with the palette color specified by the widget's style.

Here is an example of how to use `setAutofill()` to enable autofill for a `QWidget`:

my_widget = QWidget()
my_widget.setAutoFillBackground(True) # enable autofill

Note that `setAutoFillBackground()` is used instead of `setAutofill()`, which is not a valid method name.