Swap BaseHtmlPurifier execute order

[alex-code]

I've got a $classMap extension of HtmlPurifier where I set some defaults in the configure method. e.g.

protected static function configure($config)
{
    $config->set('HTML.SafeIframe', true);
    $config->set('URI.SafeIframeRegexp', '%//(www.youtube.com/embed/|player.vimeo.com/video/)%');
}

I was then trying to add a new element using the closure config,

<?= HtmlPurifier::process($content, function(HTMLPurifier_Config $config) {
    $def = $config->getHTMLDefinition(true);
    $def->addElement('input', 'Inline', 'Empty', [], ['checked' => 'Bool#checked', 'name' => 'CDATA', 'type' => 'Enum#radio']);
}) ?>

This kept failing and the <input type="radio" /> was lost. I eventually tracked this down to $config->set('HTML.SafeIframe', true); in the configure method.
It seems HTMLPurifier was clearing a definition instance so my call to addElement was lost.

Swapping the execution order so the configure method is called first fixed my issue.

From

//....  
if ($config instanceof \Closure) {
    call_user_func($config, $configInstance);
}
static::configure($configInstance);
//....

To

//....
static::configure($configInstance);        
if ($config instanceof \Closure) {
    call_user_func($config, $configInstance);
}
//....

Can anyone else see an issue by swapping the order?

[SilverFire]

Looks reasonable to me. @samdark what do you think?

[samdark]

Yes, looks OK to me.