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[Peter <971462@xxxxxxxxxxxxxxxxxx>]

Workaround (not really).
I can stop this until to the next reboot by:
- In compiz config settings manager / Unity plugin / Launcher
- disable 'Key to show the Dash'
- reset settings  'Key to show the Dash'
- close compiz config

So disable and reset the keybinding for the launcher somehow solves this for the current session. 
This isn't really a workaround, but maybe it gives some developers a clue about whats happening here internally.

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https://bugs.launchpad.net/bugs/971462

Title:
  When HUD is enabled, AltGr/Compose still causes focus stealing from
  the widget

Status in Compiz:
  Confirmed
Status in Unity:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  STR:

  1. Make sure that HUD is enabled
  2. Make sure you are using a keyboard layout that uses a Compose key (e.g. English (UK))
  3. Open http://people.canonical.com/~roman.yepishev/blur.html in firefox or chromium
  4. Put the cursor in the field and press AltGr/Compose key
  5. Observe that "Blurred" is appended on the page

  Expected results:
  Compose sends nothing (as it happens when HUD is disabled)

  Actual results:
  Widget loses focus for a fraction of the second.

  Impact:
  This is most noticeable in the web pages that make use of 'blur' event handler, such as PicasaWeb, where the image title is updated once the focus leaves the field, thus making it impossible to properly change the title of the picture.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: unity 5.8.0-0ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
  Uname: Linux 3.2.0-21-generic x86_64
  ApportVersion: 2.0-0ubuntu2
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  Date: Mon Apr  2 11:28:58 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120225)
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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