Lightweight Picker popup does not repaint after shortcut button changes value on Android

[jsfan3]

I noticed a repaint/revalidation issue with lightweight Picker shortcut buttons on Android.

Use case: a date/time picker using setUseLightweightPopup(true) and custom shortcut buttons added with addLightweightPopupButton(...), e.g. "Today", "Tomorrow", "+7 days", "Now".

On the Simulator the behavior is correct. On Android, when I tap one of these shortcut buttons, the picker value is changed programmatically, but the visible text/wheel in the lightweight picker popup is not refreshed immediately. It looks empty or stale until I touch/move the picker with a finger. After that interaction, the selected value becomes visible.

Expected behavior:

• after a shortcut button changes the picker value with setDate(...) or setTime(...), the lightweight picker popup should immediately repaint/revalidate itself and show the new value.

Current workaround used in my app:

datePicker.addLightweightPopupButton("Today",
        () -> {
            datePicker.setDate(DateTimeUtil.toDate(LocalDate.now()));
            refreshPickerAfterShortcut(datePicker);
        },
        Picker.LightweightPopupButtonPlacement.ABOVE_SPINNER,
        Component.CENTER);

timePicker.addLightweightPopupButton("Now",
        () -> {
            timePicker.setTime(DateTimeUtil.toPickerTime(currentMinuteTime()));
            refreshPickerAfterShortcut(timePicker);
        },
        Picker.LightweightPopupButtonPlacement.ABOVE_SPINNER,
        Component.CENTER);

private void refreshPickerAfterShortcut(Picker picker) {
    picker.repaint();

    Form owner = picker.getComponentForm();
    if (owner != null) {
        owner.revalidateLater();
    }

    Form current = CN.getCurrentForm();
    if (current != null) {
        current.revalidateLater();
        current.repaint();
    }

    CN.callSerially(() -> {
        picker.repaint();

        Form laterCurrent = CN.getCurrentForm();
        if (laterCurrent != null) {
            laterCurrent.revalidate();
            laterCurrent.repaint();
        }
    });
}

This workaround fixes the problem, but it feels like the lightweight picker implementation should do this internally after a shortcut button callback changes the picker value.

Codename One version: 7.0.244.