[ORYX] a workaround for containsMorphingRules and showStencilButtons when no morphing rules

fix_containsMorphingRules.js

/**
 * Fix for containsMorphingRules and showStencilButtons
 * which avoids in some case to show the shape menu
 * see this bug : http://code.google.com/p/oryx-editor/issues/detail?id=481
 */
(function(){
	var prot = ORYX.Core.StencilSet.Rules.prototype;
	var origFn = prot.containsMorphingRules;
	prot.containsMorphingRules = function(){
		// we get the caller function : 
		var caller = arguments.callee.caller;
		// if the caller function is showStencilButtons
		if(caller === ORYX.Plugins.ShapeMenuPlugin.prototype.showStencilButtons){
			// we get the first argument of the caller function
			var elements = caller.arguments[0];
			if(elements.length > 1) // if there are more than one element
				origFn.call(this); // we should not show the shape menu ...
			else{
				// we do the same treatment as containsMorphingRules
				// but we look for a morphingRule for the specific element only
				return this._morphingRules[ elements[0].getStencil().id() ] !== undefined;
			}
		}
		else // otherwise
			return origFn.call(this);
	};
})();