VerticalLayout without virtual layout throws error on drag/drop #1819
Description
When dragging an item to the end of a list with a non-virtual vertical layout, the following error is thrown:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at feathers.layout::VerticalLayout/getDropIndex()[C:\Users\josht\Development\feathersui\feathersui-starling-sdk\frameworks\projects\feathers\feathers\source\feathers\layout\VerticalLayout.as:1643]
In VirticalLayout.as, item.y is accessed without testing for the existence of item.
Below is an example to recrate the issue:
<f:Application xmlns:f="library://ns.feathersui.com/mxml"
xmlns:fx="http://ns.adobe.com/mxml/2009"
theme="feathers.themes.MetalWorksMobileTheme">
<fx:Script>
<![CDATA[
import feathers.data.ListCollection;
import feathers.layout.VerticalLayout;
override protected function initialize():void
{
super.initialize();
list.dataProvider = new ListCollection([
"Item 1",
"Item 2",
"Item 3",
"Item 4"
]);
(list.layout as VerticalLayout).useVirtualLayout = false;
}
]]>
</fx:Script>
<f:List id="list"
dragEnabled="true"
dropEnabled="true"/>
</f:Application>