7fe16d99be
Removing all event listeneres on destroying a canvas prevents circular references due to Nasal event listeners keeping a reference to the canvas in their closure. Also fix event handling with direct children of the root group and add some more helpers to the Canvas.
SimGear - Simulator Construction Tools ====================================== http://www.flightgear.org SimGear is a set of open-source libraries designed to be used as building blocks for quickly assembling 3d simulations, games, and visualization applications. SimGear is developed by the FlightGear project and also provides the base for the FlightGear Flight Simulator. Source code for SimGear is released under the GNU Library General Public License (LGPL) - see COPYING for license details. See INSTALL file for help on building SimGear.