Default rules not being selected with bt-selectpicker enabled

We were experiencing a bug that prevented default rules from being applied when the bt-selectpicker plugin was enabled.

If anyone else has the same issue, we got round it by changing the render calls to refresh in the bt-selectpicker plugin definition. ie changed this...

    this.on('afterUpdateRuleFilter', function(e, rule) {
        rule.$el.find(Selectors.rule_filter).selectpicker('render');
    });

    this.on('afterUpdateRuleOperator', function(e, rule) {
        rule.$el.find(Selectors.rule_operator).selectpicker('render');
    });

...to this...

    this.on('afterUpdateRuleFilter', function(e, rule) {
        rule.$el.find(Selectors.rule_filter).selectpicker('refresh');
    });

    this.on('afterUpdateRuleOperator', function(e, rule) {
        rule.$el.find(Selectors.rule_operator).selectpicker('refresh');
    });

Inspect the bt-selectpicker plugin definition and its afterUpdateRuleFilter and afterUpdateRuleOperator handlers; the issue identifies these entry points and the relevant selectpicker calls. Reproduce the default-rules case with the plugin enabled, then verify that the default filter and operator selections are retained.