Applies the search filter by showing/hiding corresponding nodes in the
sidebar.
@private
@param {String} strSearch - String to search.
function applySearch(strSearch) {
        sbSearch.parse(strSearch);
        setFilterBtnStates();
        $sidebarNodes.each(function () {
            var node = $(this);
            var show = true;
            if (sbSearch.scope.length > 0) {
                show = sbSearch.hasScope(node.attr('data-scope'));
            }
            if (show && sbSearch.kind.length > 0) {
                show = sbSearch.hasKind(node.attr('data-kind'));
            }
            if (show && sbSearch.keywords.length > 0) {
                // get the data keywords to be searched from each node's target
                // attribute.
                show = sbSearch.matchesAnyKeyword(node.attr('data-keywords'));
            }
            if (show) {
                node.removeClass('hidden');
            } else {
                node.addClass('hidden');
            }
        });
    }