New attempt. Instead of intercepting the "text" key in my shape
CopyWithZone, I tried the obvious thing of subclassing NSTextStorage, adding
the copying/mutablecopying protocols using the same copy technique of
creating a new object initialized with the original. Even without the
protocols, this simply did not work. It wouldn't allow me to edit text at
all. Without even trying to make a copy, apparently NSTextView will accept
nothing but the original NSTextStorage -- no subclasses allowed, even
without any overrides.
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