bug#15925: 24.3.50; error when customizing whitespace-display-mappings

[Lars Ingebrigtsen]

Mauro Aranda <maurooaranda@gmail.com> writes:

> That's why I thought it would be less confusing to show the \s at all
> times, and say "No, you can't have an empty character widget".  Having a
> truly empty character widget wouldn't be of much help, since the
> :validate function will complain anyway because the widget doesn't have
> a single character.

Ah, I see.  Thanks for the explanation.  Then your patch makes perfect
sense here, and I've applied it to Emacs 28.

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