[Bug 93142] kate + gnome renders diagonal lines

[total wormage]

Public bug reported:

Binary package hint: kate

I'm running Kate under gnome (because of POV-Ray hightlighting) in Feisty Fawn on a 64bit system.
Whenever Kate is on top it renders strange diagonal black lines over my whole screen.
There is no further breakage or crashes and Kate works just fine.

http://worm.shanara.nl/cu2/kate.jpg

** Affects: kdebase (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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kate + gnome renders diagonal lines
https://launchpad.net/bugs/93142