update drag position at the right times

rootston/seat.c

@@ -260,6 +260,7 @@ static void roots_drag_icon_handle_surface_commit(struct wl_listener *listener,
 		void *data) {
 	struct roots_drag_icon *icon =
 		wl_container_of(listener, icon, surface_commit);
+	roots_drag_icon_update_position(icon);
 	roots_drag_icon_damage_whole(icon);
 }
 
@@ -312,6 +313,8 @@ static void roots_seat_handle_new_drag_icon(struct wl_listener *listener,
 	wl_signal_add(&wlr_drag_icon->events.destroy, &icon->destroy);
 
 	wl_list_insert(&seat->drag_icons, &icon->link);
+
+	roots_drag_icon_update_position(icon);
 }
 
 void roots_drag_icon_update_position(struct roots_drag_icon *icon) {

types/data_device/wlr_drag.c

@@ -100,12 +100,12 @@ static void drag_set_focus(struct wlr_drag *drag,
 
 static void drag_icon_set_mapped(struct wlr_drag_icon *icon, bool mapped) {
 	if (mapped && !icon->mapped) {
+		icon->mapped = true;
 		wlr_signal_emit_safe(&icon->events.map, icon);
 	} else if (!mapped && icon->mapped) {
+		icon->mapped = false;
 		wlr_signal_emit_safe(&icon->events.unmap, icon);
 	}
-
-	icon->mapped = mapped;
 }
 
 static void drag_end(struct wlr_drag *drag) {