Reports

After not receiving a response for a week, I at least had some time to analyze the problem myself. Perhaps my question was too specific and complicated. The solution I found is surprisingly complex, as I need to override the custom methods for entering and exiting full screen mode.

In an NSWindowDelegate, you need to define the following optional methods to accomplish this.

    func customWindowsToEnterFullScreen(for window: NSWindow) -> [NSWindow]? {
        return [window]
    }
    

    func window(_ window: NSWindow, startCustomAnimationToEnterFullScreenWithDuration: TimeInterval) {
        if let fullScreenFrame = window.screen?.frame {
            normalFrame = window.frame
            NSAnimationContext.runAnimationGroup { context in
                context.duration = startCustomAnimationToEnterFullScreenWithDuration
                window.animator().setFrame(fullScreenFrame, display: true)
            }
        }
    }
    
    func customWindowsToExitFullScreen(for window: NSWindow) -> [NSWindow]? {
        return [window]
    }

    
    func window(_ window: NSWindow, startCustomAnimationToExitFullScreenWithDuration: TimeInterval) {
        window.styleMask = normalStyle
        NSAnimationContext.runAnimationGroup { context in
            context.duration = startCustomAnimationToExitFullScreenWithDuration
            window.animator().setFrame(normalFrame, display: true)
        }
    }

I found this after many failed attempts and some flaws I discovered in the Apple API. The working version is added as a new commit to the original files, which means you have to check out the first version if you want to reproduce the original problem.

The link as above: https://github.com/mac-curver/TestZoomAndFullScreen15_4

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