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[Bug 1091103] Re: Default blacklist string shouldn't contain double escape


** Also affects: compiz-core
   Importance: Undecided
       Status: New

** Description changed:

  Note: similar to bug #1089246, this SRU only affects precise since on
- quantal it wouldn't have an effect.
+ quantal/raring it wouldn't have an effect.
  Incorrect default setting doesn't have the wanted effect of functional
  blacklist on precise, because of character escaping problems.
  [Test Case]
  The test case relies on a bug/feature of Intel driver that on modern
  Intel hardware like sandy bridge / ivy bridge, tear-free video playback
  is not possible without compositing if the video player doesn't use
  vsync itself. Thus tearing can be seen as an indication if unredirection
  is in effect or not.
  0. Have intel hardware on Ubuntu 12.04 LTS, with which this is easiest to test
  1. In CCSM, set Composite -> unredirect_match to '(any)', ie. remove everything that comes after that, that would normally prevent unredirection in common video players.
  2. Open http://www.youtube.com/watch?v=ZCPkOpMHB7g in Firefox and play it full screen
  3. Expected result: no tearing, because blacklist is in effect and prevents unredirection on Intel (and nouveau) regardless of the match setting
  Note: radeon always has tearfree Xv output, so you can't use a similar
  test and changing the blacklist string to include 'AMD' without forcing
  non-Xv X11 output
  [Regression Potential]
  Very low. Theoretically too excessive blacklisting could restore current
  precise behavior.
  The blacklist default option in a true precise environment - the only
  environment it's supposed to have an effect with its default setting -
  is not working. It seems that the default unredirect_driver_blacklist in
  the XML contains the same double escape as the test code. So the tests
  succeed, but in reality there is extra '\' in the default setting,
  preventing the regexp from working.
  This one, the current default doesn't work:
  (nouveau|Intel).*Mesa 8\\.0
  Either one of these works instead:
  (nouveau|Intel).*Mesa 8\.0
  (nouveau|Intel).*Mesa 8.0

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  Default blacklist string shouldn't contain double escape

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