initialWindowSize :: StateVar Size
GLUT Graphics.UI.GLUT.Initialization
Controls the initial window size. Windows created by createWindow will be requested to be created with the current initial window size. The initial value of the /initial window size/ GLUT state is Size 300 300. If either the width or the height component of the initial window size is non-positive, the actual window size is left to the window system to determine. The intent of the initial window size is to provide a suggestion to the window system for a window's initial size. The window system is not obligated to use this information. Therefore, GLUT programs should not assume the window was created at the specified size. A GLUT program should use the window's reshape callback to determine the true size of the window.