As of about a week ago (no corresponding system upgrade) all windows in every app gain focus automatically on mouseover. So if I have two visible windows (in the same or different apps) and one has focus, then I mouse over the one in the background, it gets focus and is pulled to the foreground.

I can’t remember any upgrades or fresh installs of apps recently that could have caused this. Any ideas what might be going on?

Here is a short video illustrating the problem.

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