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Created October 20, 2023 21:00
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FB13291926: NSTextLayoutManager.usageBoundsForTextContainer observer is never trigerred
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FB13291926.md

I noticed that NSTextLayoutManager.usageBoundsForTextContainer is no longer KVO observable, despite being documented as KVO-compliant.. I believe it worked around macOS 13.

var usageBoundsForTextContainerObserver: NSKeyValueObservation?

usageBoundsForTextContainerObserver = textLayoutManager.observe(\.usageBoundsForTextContainer, options: [.new]) { textLayoutManager, change in
    print("never called")
}
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