windowDpSize
For use in composable functions only. init must be called first!
Returns the raw, unprocessed data showing the X and Y dimensions of the window, measured in DPs (density-independent pixels). These updates are properly adjusted when the app is in split mode or windowed mode. It will then measure the size of the app's window, instead of the entire screen.
Return
Current size of the app window, taking into account full screen, split screen, and windowed apps.
Throws
If the init function isn't called before this one.