bug#23574: 24.5; Overzealous underlining in emacs-nox

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@users.sourceforge.net>
> Date: Mon, 6 Jun 2016 20:18:06 -0400
> Cc: Colin Woodbury <cwoodbury@azavea.com>, martin rudalics <rudalics@gmx.at>, 
> 23574@debbugs.gnu.org, 
>       John Mastro <john.b.mastro@gmail.com>
> 
> I think it makes sense to not do the face extension by default.

Not even for the background color?  Or are you talking only about the
underline?

> For the case I mentioned earlier, magit isn't actually underlining
> text, it just wants to make some horizontal lines. It would be nice to
> have some way to ask the display engine to do this directly.

There's a way of doing that which we use in the VC commit log buffer,
I believe it uses the line-height property.  (I thought magit was
using that as well, no?)