Tracing this further I have found that if a ‘smart-window’ includes a ‘smart-drop-down-list’ inside a form,  then when I change/select a new drop down item then this is generating  ‘smart-window’  level ‘onClosing’ and ‘onClose’ event calls.   Is this a bug?
(I would attach a screenshot, but I can’t find a way of copy/pasting images into this forum message)
It’s no clear from your docs how I would stop a window closing via a ‘onClosing’ event handler.  The code below shows my current handler.

onClosing(event: CustomEvent): void {
  console.log('onclosing ', event);
How would I be able to detect 'onClosing' calls that were generated by the drop-down-list versus the smart window itself?