bug#11484: 23.4; Scrolling leaves traces of old text behind

[Eli Zaretskii]

> From: Jan Djärv <jan.h.d@swipnet.se>
> Date: Sun, 21 Oct 2012 21:07:11 +0200
> Cc: 11484-done@debbugs.gnu.org
> 
> The current solution is to turn off LCD-smoothing.  A better
> solution would be to draw the whole line every time.

What do you mean by "redrawing the whole line", and how would that be
different from what was redrawn in the recipe for this bug?