Package: emacs
Version: 23.0.60
Severity: minor
Tags: patch

As per emacs-devel post [1]

On X displays, when an overlay's face has underline (or overstrike
or strikethrough) set, when it crosses line end, it is only extended
to window edge when a background different to the frame background is
also set in the face.  This is different behaviour to terminal displays.

It really only matters for "unconventional" uses of
underline/overline/strikethrough through, such as use in a "show old
window position" hack [2][3]

Easily "fixed", patch attached.

[1] http://lists.gnu.org/archive/html/emacs-devel/2008-03/msg00071.html
[2] http://lists.gnu.org/archive/html/emacs-devel/2008-02/msg03044.html
[3] http://lists.gnu.org/archive/html/emacs-devel/2008-02/msg03045.html