Hide Polygon2D lines and handles when node is not visible in tree.

(cherry picked from commit b0ebbd8ecebac52836fa9ecfc27635f5d12268f2)

editor/plugins/abstract_polygon_2d_editor.cpp

@@ -273,6 +273,10 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 		return false;
 	}
 
+	if (!_get_node()->is_visible_in_tree()) {
+		return false;
+	}
+
 	Ref<InputEventMouseButton> mb = p_event;
 
 	if (!_has_resource()) {
@@ -506,6 +510,10 @@ void AbstractPolygon2DEditor::forward_canvas_draw_over_viewport(Control *p_overl
 		return;
 	}
 
+	if (!_get_node()->is_visible_in_tree()) {
+		return;
+	}
+
 	Transform2D xform = canvas_item_editor->get_canvas_transform() * _get_node()->get_global_transform();
 	// All polygon points are sharp, so use the sharp handle icon
 	const Ref<Texture> handle = get_icon("EditorPathSharpHandle", "EditorIcons");