bug#17588: 24.3.91; mouse-face glitchy

[Eli Zaretskii]

> From: Christopher Schmidt <ch@ristopher.com>
> Date: Mon, 26 May 2014 16:17:11 -0400 (EDT)
> 
> It does not look like there are calls missing.
> 
> Whenever the faulty behaviour is present, in clear_mouse_face
> NILP (hlinfo->mouse_face_window) is always true and therefore the
> highlighting is not cleared.

Which faulty behavior: the one when there's no highlighting at all, or
the one when it's present, but not cleared when the mouse pointer
moves off the text?

> clear_mouse_face w/o bug:

"w/o bug" meaning what? a different Emacs version or the same version,
but when it behaves correctly?