Highlighted NSTextFieldCells draw their text in white. That's easy
enough to duplicate in a subclass. But when the enclosing view is
inactive -- say, when it's in a background window -- the row highlight
color turns light gray and NSTextFieldCells draw their text in black.
How does a cell know whether to do this? I can't figure out how to ask
the enclosing view what state it's in. I'm sure this absurdly trivial,
but I've spent 20 minutes digging through the docs and I can't turn up
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