pub const WINDOW_GRACE: u32 = 10;Expand description
How long a window is given to close by itself before it is killed, in seconds.
The trial measured a clean close in 1.7 to 2.3 seconds, with the application writing its state out; ten leaves room for a machine under load, and it is what the engines default to anyway. It is stated rather than left to the engine so that it does not differ from machine to machine.