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
if (selectedResources.length == 0) {
			message = WorkbenchNavigatorMessages.DropAdapter_dropOperationErrorOther;
		} else {
			MoveFilesAndFoldersOperation operation;
			operation = new MoveFilesAndFoldersOperation(getShell());
			message = operation.validateDestination(destination,
					selectedResources);
		}
		if (message != null) {
			return WorkbenchNavigatorPlugin.createErrorStatus(0, message, null);
		}
		return Status.OK_STATUS;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.ui.navigator.CommonDropAdapterAssistant#handlePluginTransferDrop(org.eclipse.jface.viewers.IStructuredSelection, java.lang.Object)
	 */
	public IStatus handlePluginTransferDrop(IStructuredSelection aDragSelection, Object aDropTarget) {
		IContainer target = getActualTarget((IResource) aDropTarget);
		IResource[] resources = getSelectedResources(aDragSelection);
		
		MoveFilesAndFoldersOperation operation = new MoveFilesAndFoldersOperation(
				 getShell());
		operation.copyResources(resources, target);
		if (target != null && target.isAccessible()) {
			try {
				target.refreshLocal(IResource.DEPTH_ONE, null);
			} catch (CoreException e) {
			}
		}