Called when Expose event comes. See Xlib manual to understand the arguments.
* Return false if you want Simpledisplay to copy backbuffer, or true if you did it yourself.
* You will probably never need to setup this handler, it is for very low-level stuff.
*
* WARNING! Xlib is multithread-locked when this handles is called!
Called when Expose event comes. See Xlib manual to understand the arguments. * Return false if you want Simpledisplay to copy backbuffer, or true if you did it yourself. * You will probably never need to setup this handler, it is for very low-level stuff. * * WARNING! Xlib is multithread-locked when this handles is called!