Bug 16308 [DND] dnd from os to navigator shows an incorrect icon
smoke test for 0518 it shows a move icon although move will not happen
bundles/org.eclipse.ui.views/src/org/eclipse/ui/views/navigator/NavigatorDropAdapter.java
extends PluginDropAdapter
	implements IOverwriteQuery {
		
	/**
	 * The time the mouse first started hovering over the current target
	 */
	private long hoverStart = 0;
	/**
	 * The amount of time to hover over a tree item before expanding it
	 */
	private static final long hoverThreshold = 1500;
	/**
	 * A flag indicating that the drop has been cancelled by the user.
	 */
	private boolean isCanceled = false;
	/**
	 * A flag indicating that overwrites should always occur.
	 */
	private boolean alwaysOverwrite = false;
	
	/**
	 * The selected resources if the drag and drop operation takes place 
	 * within the same widget.
	 */
	private IResource[] sourceResources;
	
	/**
	 * The last valid operation.
	 */