In 'Site Administration"-[Users]-[Accounts]-[Browse List of Users],
When we search the user newly, at first we must delete old active filters by pushing "Remove all filters".
We had developed a method to omit this troublesome work by adding new check box.
Let you try the new feature!

Patches for Moodle1.9 are as follows;
(adding one statement and one block, commenting out one statement only!)

(a) user/filters/lib.php

class user_filtering, function user_filtering()

        foreach ($fieldnames as $fieldname=>$advanced) {
            if ($field = $this->get_field($fieldname, $advanced)) {
                $this->_fields[$fieldname] = $field;
            }
        }

        // fist the new filter form
        $this->_addform = new user_add_filter_form($baseurl, array('fields'=>$this->_fields, 'extraparams'=>$extraparams));
        if ($adddata = $this->_addform->get_data(false)) {
// (Shirai): add from here
            if (!empty($adddata->removealladd) && ($adddata->removealladd)) $SESSION->user_filtering = array();
// (Shirai): Add to here
            foreach($this->_fields as $fname=>$field) {
                $data = $field->check_data($adddata);
                if ($data === false) {
                    continue; // nothing new
                }
                if (!array_key_exists($fname, $SESSION->user_filtering)) {
                    $SESSION->user_filtering[$fname] = array();
                }
                $SESSION->user_filtering[$fname][] = $data;
            }

(b) user/filters/user_filter_forms.php

class user_add_filter_form, function definition()

    function definition() {
        $mform =& $this->_form;
        $fields = $this->_customdata['fields'];
        $extraparams = $this->_customdata['extraparams'];

        $mform->addElement('header', 'newfilter', get_string('newfilter','filters'));

        foreach($fields as $ft) {
            $ft->setupForm($mform);
        }

        // in case we wasnt to track some page params
        if ($extraparams) {
            foreach ($extraparams as $key=>$value) {
                $mform->addElement('hidden', $key, $value);
            }
        }

        // Add button
// (Shirai): comment out this line
// $mform->addElement('submit', 'addfilter', get_string('addfilter','filters'));
// (Shirai): add from here
        $objs = array();
        $objs[] = &$mform->createElement('submit', 'addfilter', get_string('addfilter', 'filters'));
        $objs[] = &$mform->createElement('checkbox', 'removealladd', null, 'Add filter after removing all');
        $mform->addElement('group', 'addfiltergrp', '', $objs, ' ', false);
        $mform->setDefault('removealladd', '0');
// (Shirai): add from here

        // Don't use last advanced state
        $mform->setShowAdvanced(false);
    }
}