dwm-flexipatch/patch/fakefullscreenclient.c

void
togglefakefullscreen(const Arg *arg)
{
	Client *c = selmon->sel;
	if (!c)
		return;

	if (c->fakefullscreen != 1 && c->isfullscreen) { // exit fullscreen --> fake fullscreen
		c->fakefullscreen = 2;
		setfullscreen(c, 0);
	} else if (c->fakefullscreen == 1) {
		setfullscreen(c, 0);
		c->fakefullscreen = 0;
	} else {
		c->fakefullscreen = 1;
		setfullscreen(c, 1);
	}
}