Exit full screen mode if changing window (with alt-tab) #1988
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If the user leaves full screen window by alt-tab or similar method (unintended way), 86Box goes into an unstable state; mouse cursor can be hidden or clipped to an arbitrary area and the rendering can be distorted.
Fixing this "properly" would mean refactoring the way windows and renderers are created and going through the process in which window and video resizing works to ensure proper operation.
In this PR is a simpler solution that makes 86Box leave full screen if the user leaves the program.
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