Hello,
My bad, I didn't realized that the "pageInfo" is not loaded via the common function ; so the loading of the "search" is missing.
In the view.html.php file of the vendormarket folder ; please replace
$pageInfo->limit->start = $app->getUserStateFromRequest($this->paramBase . '.limitstart', 'limitstart_' . $this->params->get('main_div_name'), 0, 'int');
By
$pageInfo->limit->start = $app->getUserStateFromRequest($this->paramBase . '.limitstart', 'limitstart_' . $this->params->get('main_div_name'), 0, 'int');
$pageInfo->search = JString::strtolower($app->getUserStateFromRequest($this->paramBase.'.search', 'search', '', 'string'));
$pageInfo->search = trim($pageInfo->search);
And it would activate the search.
Regards,