On the latest MacOS. I have additional displays connected if it matters.
Say you grab the top of any window of any app, so as to move the window.
In many cases the overall window becomes, that is to say zooms down in size, to a "large icon" of the window (say, a couple inches square) which you then move. (When you let go, the window again becomes the normal size.)
- What, specifically, is the trigger for this happening?
I have not been able to work out exactly what it is - moving your hand fast? grabbing a particular spot? IDK.
More importantly,
- how to absolutely, completely, eliminate this behavior?
CAPTURED!
I was moving a normal-size Pages window and it happened.
I used keystroke to capture all displays, and, it is shown.
Could it be something only affecting Pages?
I can't quite repro exactly what makes it happen / not happen. (Perhaps, which part of the top bar of the Pages window?)
Note that the screen cap does not show my cursor-mouse, but, it was pointing at / holding right in the CENTER of the mystery mini-ghost window.