I tested this on R2022a as well, and it's still there. And since no one responded to my question, I submitted it as a bug. Let me know if anyone comes up with a workaround.
Possible bug with WindowState property not updating
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I'm using Matlab 2019b, where I observed that the windowstate property is not updated when a user clicks the unmaximize button. To recreate:
%create maximized figure
h.WindowState = 'maximized';
=> now click the unmaximize button of the window
%setting focus to the figure will again maximize the window despite giving
%no such command
I have two questions:
1) is there way to track when the unmaximize button is pressed (similar to SizeChangedFcn but only for (un)maximizing a figure?)?
2) can this bug be fixed in a future version?