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

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Thu, 1 Mar 2018 00:36:46 -0800
> Cc: Alp Aker <alptekin.aker@gmail.com>, 30553@debbugs.gnu.org
> 
> On Wed, Feb 28, 2018 at 9:56 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> > Just treat Qunbound as the default value of the respective variable.
> 
> Thank you for the assistance. New patch attached. Please let me know
> if there are any other improvements I can make.

Thanks, pushed to the master branch.

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