systray: add / override class hints for the systray clients (allows for compositors to exlude them from shadows)

dwm.c

@@ -1048,6 +1048,7 @@ clientmessage(XEvent *e)
 			c->next = systray->icons;
 			systray->icons = c;
 			XGetWindowAttributes(dpy, c->win, &wa);
+
 			c->x = c->oldx = c->y = c->oldy = 0;
 			c->w = c->oldw = wa.width;
 			c->h = c->oldh = wa.height;
@@ -1060,6 +1061,8 @@ clientmessage(XEvent *e)
 			updatesystrayicongeom(c, wa.width, wa.height);
 			XAddToSaveSet(dpy, c->win);
 			XSelectInput(dpy, c->win, StructureNotifyMask | PropertyChangeMask | ResizeRedirectMask);
+			XClassHint ch = {"dwmsystray", "dwmsystray"};
+			XSetClassHint(dpy, c->win, &ch);
 			XReparentWindow(dpy, c->win, systray->win, 0, 0);
 			/* use parents background color */
 			swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
@@ -3448,7 +3451,7 @@ updatebars(void)
 	XClassHint ch = {"dwm", "dwm"};
 	for (m = mons; m; m = m->next) {
 		for (bar = m->bar; bar; bar = bar->next) {
-			if (!bar->win) { // TODO add static status controls to not create / show extra bar?
+			if (!bar->win) {
 				#if BAR_ALPHA_PATCH
 				bar->win = XCreateWindow(dpy, root, bar->bx, bar->by, bar->bw, bar->bh, 0, depth,
 				                          InputOutput, visual,