PHP Tidy removes whitespace and inserts newlines

I'd like to use PHP Tidy to ensure my xml is valid before I load it into a DomDocument.

However, I don't want Tidy to change something to my formatting - I only want it to repair problems like unbalanced tags, etc.

An example of the problem can be seen at this page: http://www.tek-tips.com/viewthread.cfm?qid=1654452

My own example is the following.

Input: <ex><context>собр<stress>а</stress>ние</context> акцион<stress>е</stress>ров — <stress>aa</stress>ndeelhoudersvergadering</ex> (which is valid xml already)

Expected output: <ex><context>собр<stress>а</stress>ние</context> акцион<stress>е</stress>ров — <stress>aa</stress>ndeelhoudersvergadering</ex> (there is breaking whitespace between </context> and актион)

Actual output:

<ex>
<context>собр
<stress>а</stress>ние</context>акцион
<stress>е</stress>ров — 
<stress>aa</stress>ndeelhoudersvergadering</ex>

(it removed the space between </context> and актион which will make the text unreadable, and it inserted newlines after each tag)

My code is:

function TidyXml($inputXml)
    {
        $config = array(
            'indent'         => false,
            'output-xml'     => true,
            'input-xml'     => true,
        );

        $tidy = new tidy();
        $tidy->parseString($inputXml, $config, 'utf8');
        $tidy->cleanRepair();
        $cleanXml = tidy_get_output($tidy);
        return $cleanXml;
    }

I tried changing several options, but didn't succeed.