applied patch of Paul Liu to allow onthefly resizing due to xrandr changes

event.c

@@ -207,6 +207,24 @@ configurerequest(XEvent *e) {
 	XSync(dpy, False);
 }
 
+static void
+configurenotify(XEvent *e) {
+	Client *c;
+	XConfigureEvent *ev = &e->xconfigure;
+	XWindowChanges wc;
+
+	if (ev->window == root && (ev->width != sw || ev->height != sh)) {
+		sw = ev->width;
+		sh = ev->height;
+		wah = sh - bh;
+		waw = sw;
+		XFreePixmap(dpy, dc.drawable);
+		dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
+		XResizeWindow(dpy, barwin, sw, bh);
+		lt->arrange();
+	}
+}
+
 static void
 destroynotify(XEvent *e) {
 	Client *c;
@@ -333,6 +351,7 @@ unmapnotify(XEvent *e) {
 void (*handler[LASTEvent]) (XEvent *) = {
 	[ButtonPress] = buttonpress,
 	[ConfigureRequest] = configurerequest,
+	[ConfigureNotify] = configurenotify,
 	[DestroyNotify] = destroynotify,
 	[EnterNotify] = enternotify,
 	[LeaveNotify] = leavenotify,