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
*/
	private IStatus performFileDrop(final CommonDropAdapter anAdapter, Object data) {
		final int currentOperation = anAdapter.getCurrentOperation();
		MultiStatus problems = new MultiStatus(PlatformUI.PLUGIN_ID, 0,
				WorkbenchNavigatorMessages.DropAdapter_problemImporting, null);
		mergeStatus(problems,
				validateTarget(anAdapter.getCurrentTarget(), anAdapter
						.getCurrentTransfer(), currentOperation));
		final IContainer target = getActualTarget((IResource) anAdapter
				.getCurrentTarget());
		final String[] names = (String[]) data;
		
		
		
		Display.getCurrent().asyncExec(new Runnable() {
			public void run() {
				getShell().forceActive();
				new CopyFilesAndFoldersOperation(getShell()).copyOrLinkFiles(names, target, currentOperation);
			}
		});
		return problems;
	}
	/**
	 * Ensures that the drop target meets certain criteria
	 */
	private IStatus validateTarget(Object target, TransferData transferType,
			int dropOperation) {
		if (!(target instanceof IResource)) {
			return WorkbenchNavigatorPlugin
					.createInfoStatus(WorkbenchNavigatorMessages.DropAdapter_targetMustBeResource);