Description:
------------
Description:
------------
Appending XML source to fragment and then inserting fragment to document tree should result in consitent white space handling, based on document's preserveWhiteSpace property value.

Is it possible to make DOMDocumentFragment::appendXML method honor fragment's ownerDocument->preserveWhiteSpace property value?

Thank you.

Reproduce code:
---------------
$doc = new DOMDocument();
$doc->preserveWhiteSpace = false;
$doc->loadXML('<?xml version="1.0" encoding="utf-8"?>
<root>
	<child/>
</root>
');
$frag = $doc->createDocumentFragment();
$frag->appendXML('
<fragment>
	<child/>
</fragment>
');
$doc->documentElement->appendChild($frag);

$doc->formatOutput = false;
echo $doc->saveXML();

Expected result:
----------------
<?xml version="1.0" encoding="utf-8"?>
<root><child/><fragment><child/></fragment></root>


Actual result:
--------------
<?xml version="1.0" encoding="utf-8"?>
<root><child/>
<fragment>
	<child/>
</fragment>
</root>