Public bug reported:

While Alt+TABing between windows I accidentally summoned the HUD and
triggered a case where all my keyboard input was ignored (including ESC,
backspace, Return but _not_ Ctrl+Alt+Fx).

How to reproduce:

 1. Hit Alt key
 2. Once the dash appears
 3. Start typing something (example: abcdef)
 4. Hit the TAB key
 5. Notice that keyboard input is ignored in the HUD (example: pressing other 
random keys, including ESC does nothing)

Workaround:

Clicking the mouse outside of the HUD make the HUD go away and keyboard
input returns

What I expect:

 1. The HUD not to appear unless specifically summoned (not relevant for this 
bug)
 2. The HUD to respond to keystrokes once summoned

Misc:

 1. I can successfully summon the HUD and dismiss it by pressing the ESC key as 
expected if I haven't pressed the TAB key.
 2. This bug seems to occur regardless of which application I am currently 
using. Tested Firefox, Terminator and Evince.
 3. I am running Unity-3D

System details:

 $ cat /etc/lsb-release
 DISTRIB_ID=Ubuntu
 DISTRIB_RELEASE=12.04
 DISTRIB_CODENAME=precise
 DISTRIB_DESCRIPTION="Ubuntu precise (development branch)"

 $ dpkg-query --show compiz unity
 compiz  1:0.9.7.4-0ubuntu3
 unity   5.8.0-0ubuntu2

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/978970

Title:
  hud fails to accept keyboard input after pressing TAB

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