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
sources = checker.checkReadOnlyResources(sources);
		MoveFilesAndFoldersOperation operation = new MoveFilesAndFoldersOperation(getShell());
		operation.copyResources(sources, target);
		
		return problems;
	}
	
	/**
	 * @see IOverwriteQuery#queryOverwrite
	 */
	public String queryOverwrite(String pathString) {
		if (alwaysOverwrite)
			return ALL;
		final String returnCode[] = { CANCEL };
		final String msg = ResourceNavigatorMessages.format("DropAdapter.overwriteQuery", new Object[] { pathString }); 
		final String[] options =
			{
				IDialogConstants.YES_LABEL,
				IDialogConstants.YES_TO_ALL_LABEL,
				IDialogConstants.NO_LABEL,
				IDialogConstants.CANCEL_LABEL };
		getDisplay().syncExec(new Runnable() {
			public void run() {
				MessageDialog dialog = new MessageDialog(getShell(), ResourceNavigatorMessages.getString("DropAdapter.question"), null, msg, MessageDialog.QUESTION, options, 0); 
				dialog.open();
				int returnVal = dialog.getReturnCode();
				String[] returnCodes = { YES, ALL, NO, CANCEL };
				returnCode[0] = returnVal < 0 ? CANCEL : returnCodes[returnVal];
			}
		});