I think Window.addResizeHandler is a last resort to resize widgets according to the size of the browser window. And I have come to that last resort.
So, I have onResize sizing up my widgets beautifully, except when the application starts up.
How do I trigger at startup of the app, such a widget resize calculation done by onResize?
I cannot/should not tell users to use the mouse to deliberately resize the browser so as to trigger optimal widget distribution.
Sorry for answering my own question. The answer is …
on module load, use Window.getClientWidth/Height and apply the width/height to the resize routine used by the resize handler.