dwm-flexipatch/patch/winview.c

/* Selects for the view of the focused window. The list of tags */
/* to be displayed is matched to the focused window tag list. */
void
winview(const Arg* arg)
{
	Window win, win_r, win_p, *win_c;
	unsigned nc;
	int unused;
	Client* c;
	Arg a;

	if (!XGetInputFocus(dpy, &win, &unused)) return;
	while (XQueryTree(dpy, win, &win_r, &win_p, &win_c, &nc)
	      && win_p != win_r) win = win_p;

	if (!(c = wintoclient(win))) return;

	a.ui = c->tags;
	view(&a);
}