Bug 312540 [LinkedResources] Copy resource in Navigator and Project Explorer always shows dialog
N20100511-2000. When copying an IFile from one to another folder in the Navigator or Project Explorer, I always get the dialog no matter how I've set the preferences on the 'Linked Resources' page (even if I disable linked resources).
bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/navigator/resources/ResourceDropAdapterAssistant.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.navigator.CommonDropAdapterAssistant#handleDrop(CommonDropAdapter,
	 *      DropTargetEvent, Object)
	 */
	public IStatus handleDrop(CommonDropAdapter aDropAdapter,
			DropTargetEvent aDropTargetEvent, Object aTarget) {
		if (Policy.DEBUG_DND) {
			System.out
					.println("ResourceDropAdapterAssistant.handleDrop (begin)"); 
		}
		
		if (aTarget == null || aDropTargetEvent.data == null) {
			return Status.CANCEL_STATUS;
		}
		IStatus status = null;
		IResource[] resources = null;
		TransferData currentTransfer = aDropAdapter.getCurrentTransfer();
		if (LocalSelectionTransfer.getTransfer().isSupportedType(
				currentTransfer)) {
			resources = getSelectedResources();
			aDropTargetEvent.detail = DND.DROP_NONE;
		} else if (ResourceTransfer.getInstance().isSupportedType(
				currentTransfer)) {
			resources = (IResource[]) aDropTargetEvent.data;
		}
		if (FileTransfer.getInstance().isSupportedType(currentTransfer)) {
			status = performFileDrop(aDropAdapter, aDropTargetEvent.data);
		} else if (resources != null && resources.length > 0) {