Details
Description
Looking in the code I file places where 'selectedSearchContactIds' is reset & where it is used, if set, but nowhere where it is set.
In JIRA the original ticket refers to the ability to merge 2 contacts (which uses their ids in the url) & to merge multiple contacts (which was not implemented). I'm pretty sure these are traces of an incomplete implementation of the latter
// reset from session, CRM-3526
$session = CRM_Core_Session::singleton();
if ($this->_force && $session->get('selectedSearchContactIds'))