add WM_TRANSIENT_FOR event support: moves dialogs, toolbars and such to

the group of the main application window; based on a diff from Alexander
Polakov with CLIENT_IGNORE flag suggestion from oga@.

ok oga@

calmwm.h

@@ -328,6 +328,7 @@ void			 client_send_delete(struct client_ctx *);
 void			 client_setactive(struct client_ctx *, int);
 void			 client_setname(struct client_ctx *);
 int			 client_snapcalc(int, int, int, int, int);
+void			 client_transient(struct client_ctx *);
 void			 client_unhide(struct client_ctx *);
 void			 client_vertmaximize(struct client_ctx *);
 void			 client_warp(struct client_ctx *);

client.c

@@ -113,6 +113,8 @@ client_new(Window win, struct screen_ctx *sc, int mapped)
 
 	XAddToSaveSet(X_Dpy, cc->win);
 
+	client_transient(cc);
+
 	/* Notify client of its configuration. */
 	xu_configure(cc);
 
@@ -869,6 +871,21 @@ client_freehints(struct client_ctx *cc)
 		XFree(cc->app_class);
 }
 
+void
+client_transient(struct client_ctx *cc)
+{
+	struct client_ctx	*tc;
+	Window			 trans;
+
+	if (XGetTransientForHint(X_Dpy, cc->win, &trans)) {
+		if ((tc = client_find(trans)) && tc->group) {
+			group_movetogroup(cc, tc->group->shortcut - 1);
+			if (tc->flags & CLIENT_IGNORE)
+				cc->flags |= CLIENT_IGNORE;
+		}
+	}
+}
+
 static int
 client_inbound(struct client_ctx *cc, int x, int y)
 {

xevents.c

@@ -191,6 +191,9 @@ xev_handle_propertynotify(XEvent *ee)
 		case XA_WM_NAME:
 			client_setname(cc);
 			break;
+		case XA_WM_TRANSIENT_FOR:
+			client_transient(cc);
+			break;
 		default:
 			/* do nothing */
 			break;