[PyQt] logging.Handler not working with QThreads

[Lukas Hetzenecker]

Hello,

I created a QTextEdit where I wanted to display log messages.
A logging.Handler should do this job.

It worked with one thread well, but when I start a QThread the text on all 
widgets is removed and I get many errors in my konsole:

X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0
X Error: RenderBadGlyphSet (invalid GlyphSet parameter) 177
  Extension:    152 (RENDER)
  Minor opcode: 25 (RenderCompositeGlyphs32)
  Resource id:  0x0

.. and so on

I attatched a small example to this mail.

Could anybody tell me what I'm doing wrong?
Thanks for you help,
Lukas
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