bug#13011: 24.2; Text flickering moving cursor with box around text enabled

[Eli Zaretskii]

> Date: Tue, 27 Nov 2012 11:42:24 +0100
> From: mario giovinazzo <mario.giovinazzo@virgilio.it>
> 
> The problem occurs when I customize hl-line enabling box around text
> to make evident the current line.
> The box around text (also 1 pixel) changes the inside text position
> thus producing a vertical and horizontal flickering when I move the cursor.
> Setting a box of width -1 (a negative number) stops the vertical
> flickering but still remains the horizontal one.

Can you please show a minimal recipe to reproduce this starting with
"emacs -Q"?  That will make the job of looking into this much easier.

Thanks.