Re: Propertizing the minor-mode-alist

[James Clark]

> How about using fonts to show people the errors?

It does this already.  It defines a face which it uses just for
highlighting errors; it defaults to red underlining.

One thing that I think would be a nice touch here is if emacs could do
wavy underlines.  It's just a little more visually distinctive than a
straight underline and slightly more suggestive of an error condition. 
Perhaps one could allow the underline face attribute to have a list
value like the box attribute can:

  :underline (:line-width WIDTH :color COLOR :style STYLE)

where style could be things like wavy, dotted, dashed etc.

James