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

[Lars Ingebrigtsen]

Mauro Aranda <maurooaranda@gmail.com> writes:

> I attach a patch that should fix this (but that does not change the
> way the characters are displayed) and that doesn't introduce the
> breakage of Bug#3136 (for which I added a test).

Thanks; applied to Emacs 28.

The bits that remains to be fixed here is the display of the TAB/newline
(etc.) characters?

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