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$.fn.closest_descendent = function(filter) {
    var $found = $(),
        $currentSet = this; // Current place
    while ($currentSet.length) {
        $found = $currentSet.filter(filter);
        if ($found.length) break;  // At least one match: break loop
        // Get all children of the current set
        $currentSet = $currentSet.children();
    }
    return $found.first(); // Return first match of the collection
}