Just a correction. It's not openURL but NSWorkspace.shared.open that opens the document. It works fine, but, as I said, it's now bound to a file that is not where the user wants (the app is sandboxed, so it's hiding inside the container in the Library folder).
Mussau
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Logging sizes produces these numbers for heights of contentSize, viewSize, myContentSize on several iterations of run, quit, run:
window content size 420.0, scroll content size 367.0, view size 305.5;
window content size 420.0, scroll content size 367.0, view size 305.5;
window content size 420.0, scroll content size 343.0, view size 305.5;
window content size 420.0, scroll content size 367.0, view size 305.5
Why the variation?