Best way to determine user's screensize?

[Random832]

On Fri, Oct 30, 2020, at 12:05, Grant Edwards wrote:
> Why do you think that's something your application needs to know?
> 
> I _hate_ applications that think just because they've been started
> they now own the entire computer and everything reachable from it.
> 
> All you need to know is how big your application window is. The user's
> available screen size is none of your business.

The application decides how big the application window is. The user can resize it, but there's no reason for the screen size not to be one of the inputs considered for the initial choice.