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[Adric Riedel <adric.riedel@xxxxxxxxx>]

I am having, and have been having, this problem since KDE 4.0 started;
this is the last remaining visual glitch from that era, as far as I can
tell.  I thought it was just because I use vertical taskbars...

The biggest difference between what I see and the current explanation is
that the transparent rectangles can be in different parts of the screen.
The attached screenshot demonstrates this:  I moused over the
Quickaccess browser and when the tooltip vanished, it carved a chunk out
of the konsole window (then I moused over Quickaccess again for the
screenshot).

The top three places for the problem to appear are all near things that
generate tooltips: next to the device manager (shown here), next to the
battery meter, and next to the K menu.  It's as if KDE forgot which icon
generated the tooltip and erased the wrong part.

Practical question: having read this bug report and the KDE bug report,
do I turn compositing on, or off?

** Attachment added: "KDE showing the tooltip repaint problem"
   http://launchpadlibrarian.net/34364899/kplasma_problem.jpg

-- 
Window redrawing does not work properly with KDE4 taskbar tooltips.
https://bugs.launchpad.net/bugs/325074
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