bug#30553: 26.0.91; underline appears beneath line-spacing rather than beneath text

[Aaron Jensen]

On Tue, Feb 27, 2018 at 8:18 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> and similarly with other variables (except that a boolean variable
> will return a value of Qt or Qnil, not a number).

Thank you for the feedback. I used NILP and Fbuffer_local_value
because I saw that used elsewhere. If that's not right, please let me
know.

> I think this symbol should be in xdisp.c, where the variable is
> defined.

Done.

Patch attached, thanks!

0001-Allow-buffer-local-underline-position-vars.patch
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