M src/server.c → src/server.c

@@ -364,6 +364,20 @@ server.monitor[0].names = 0;
 	}
 }
 
+void print_monitors()
+{
+	fprintf(stderr, "Number of monitors: %d\n", server.nb_monitor);
+	int i;
+	for (i = 0; i < server.nb_monitor; i++) {
+		fprintf(stderr, "Monitor %d: x = %d, y = %d, w = %d, h = %d\n",
+				i+1,
+				server.monitor[i].x,
+				server.monitor[i].y,
+				server.monitor[i].width,
+				server.monitor[i].height);
+	}
+}
+
 int server_get_number_of_desktops()
 {
 	return get_property32(server.root_win, server.atom._NET_NUMBER_OF_DESKTOPS, XA_CARDINAL);

M src/server.h → src/server.h

@@ -153,6 +153,7 @@ void get_root_pixmap();
 
 // detect monitors and desktops
 void get_monitors();
+void print_monitors();
 void get_desktops();
 int server_get_number_of_desktops();
 

M src/taskbar/task.c → src/taskbar/task.c

@@ -533,6 +533,12 @@ (hide_task_diff_monitor || nb_panel > 1)) {
 					hide = 1;
 				}
 				if (1 - hide != tsk1->area.on_screen) {
+					fprintf(stderr, "%s %s task %ld '%s' (panel monitor = %d)\n",
+							__FUNCTION__,
+							hide ? "hiding" : "showing",
+							tsk->win,
+							tsk->title ? tsk->title : "??",
+							((Panel*)tsk->area.panel)->monitor + 1);
 					tsk1->area.on_screen = 1 - hide;
 					set_task_redraw(tsk1);
 					Panel *p = (Panel*)tsk->area.panel;

M src/util/window.c → src/util/window.c

@@ -130,7 +130,16 @@ {
 	int i, x, y;
 	Window src;
 
-	XTranslateCoordinates(server.dsp, win, server.root_win, 0, 0, &x, &y, &src);
+	XTextProperty xname;
+	char *name;
+	if (XGetWMName(server.dsp, win, &xname)) {
+		name = strdup((char*)xname.value);
+		XFree(xname.value);
+	} else {
+		name = strdup("??");
+	}
+
+	Bool result = XTranslateCoordinates(server.dsp, win, server.root_win, 0, 0, &x, &y, &src);
 	x += 2;
 	y += 2;
 	for (i = 0; i < server.nb_monitor; i++) {
@@ -139,9 +148,14 @@ if (y >= server.monitor[i].y && y <= (server.monitor[i].y + server.monitor[i].height))
 				break;
 	}
 
-	//printf("window %lx : ecran %d, (%d, %d)\n", win, i, x, y);
-	if (i == server.nb_monitor) return 0;
-	else return i;
+	if (i == server.nb_monitor)
+		i = 0;
+
+	printf("\n%s: window %ld '%s': monitor %d, x = %d, y = %d, result = %s\n", __FUNCTION__, win, name, i+1, x, y, result ? "True" : "False");
+	print_monitors();
+	free(name);
+
+	return i;
 }
 
 void window_get_coordinates (Window win, int *x, int *y, int *w, int *h)