@property<EOL><INDENT>def buffer_size(self) -> Tuple[int, int]:<DEDENT>
return (self.buffer_width, self.buffer_height)<EOL>
(width, heigh) buffer size of the window.

This is the actual buffer size of the window
taking UI scale into account. A 1920 x 1080
window running in an environment with UI scale 2.0
would have a 3840 x 2160 window buffer.