If QML ComboBox is closed through a timer (comboBox.visible = false) while the popup is open, the popup is not closed.

In controls 2 there is a workaround, setting focus = false in onVisibilityChanged slot of the ComboBox closes the popup. But this workaround doesn't work for controls 1.

onVisibleChanged: {
    comboBox.focus = false
}

Possible workaround for controls 1 is to do:

onVisibleChanged: {
    if (__popup.__popupVisible)
    __popup.__dismissAndDestroy();
}