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[ENXF NET]

Inconsistent prefix filter handling in XF and XFRM

I noticed two inconsistencies in the prefix filtering code between XF threads and XFRM resources.

Prefix validation

XF validates a selected thread prefix before adding it to the filters:

if ($input['prefix_id'] && $forum->isPrefixValid($input['prefix_id']))
{
$filters['prefix_id'] = $input['prefix_id'];
}

XFRM does not perform an equivalent validation for resource prefixes:

if ($input['prefix_id'])
{...

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