I tried to reproduce the problem locally but to no avail – everything is working as expected on our side. Could you please check this screencast and let us know if we miss some step in order to reproduce the issue on our side?
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That screencast was really cool! Great way to show behavior.
I did notice that your browser window already had a vertical scrollbar because the content stretched past the bottom of the screen. Mine does not, so (to clarify) when my browser's scrollbar flashes I mean a disabled/greyed scrollbar appears for a second and then the scrollbar disappears entirely as the content is not long enough.
It may actually be due to a CSS sticky footer technique I'm using. When I took that footer out, the behavior was not evident. Not sure how the two are competing, but I think we can close this thread. Thank you for your time.