Setting selected_value on a Picker does not update the search box

TextFieldPickerPlugin has some code that does the right thing in some
instances (i.e. update the search box as the picker is shown):

        this.doAfter('show', function() {
            var selected_value = null;
            if ( input.get("value") ) {
                selected_value = input.get("value");
            }
--> this.get('host')._search_input.set('value', selected_value);
            this.get('host').set(SELECTED_VALUE, selected_value);
        });

However, this code should probably be chained to selected_valueChange:

    picker.after("selected_valueChange", function(e) {
        picker._search_input.set("value", e.newVal);
    });

This is what I'll be doing in lp.registry.distroseries.differences. I
would have made the change to the Picker itself but I'm unsure of the
repercussions, so want someone else to also think about it.