bug#18722: Correction

[Eli Zaretskii]

> Date: Thu, 16 Oct 2014 13:41:09 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: malsburg@posteo.de, 18722@debbugs.gnu.org
> 
> The behavior seems time related: The longer another application's window
> covers that of Emacs, the higher is the probability that the Emacs frame
> is not redrawn.  Clicking on a menu item, resizing the frame, or
> switching do it via M-TAB gets it out of the situation.  Clicking with
> the mouse into the frame doesn't.

Is Emacs consuming any CPU, before you click on it?