Question about QApplication.fontMetrics() in PyQt6

[RedHuli]

This is a simple question I have about using QApplication.fontMetrics() in
PyQt6. When I used it before in PyQt5, I never received an error message.
However, when I want to get the font metrics I now get the error :

font_size = QApplication.fontMetrics() # Calculate the size of the text


AttributeError: type object 'QApplication' has no attribute 'fontMetrics'

I am reimplementing the sizeHint() method when subclassing
QStyledItemDelegate.

Thanks!
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