Public bug reported:

The unity dash and the "Keyboard Shortcuts" help overlay should not be
displayed when <Super> is pressed in combination with any other key -
even if it's just another modifier or if no other action is associated
with the combination. This situation has become worse after the new
keyboard shortcuts landed in today's updates.

Cases:
1. Press <Super>+<Shift>+Arrow to switch to a different desktop, releasing the 
key combo very quickly. The unity dash will open.

2. Hold <Super>+<Shift> while you use the arrow keys to find the desktop
you are looking for. The help overlay will display, covering the
desktop.

3. Press <Super>+<Ctrl>, then realize you were going for
<Super>+<Shift>, and depending on whether you've released <Super> or not
you'll be presented with the dash or the help overlay, when you were
obviously trying to do something else.

4. Similarly, mistype <Super>+1 (to open, say, nautilus) as <Super>+q,
releasing quickly. You'll be shown the dash, even though you were
obviously trying to do something else. This does not happen when you
release <Super>+1 quickly, so I assume the dash is being inhibited
specifically when a shortcut exists for the combination - it should also
be inhibited when no shorcut is associated with it.

A fourth case that is not really part of this problem but is related:
4. Press <Super>+<Shift>+Arrow to switch to a different desktop, releasing the 
key combo less quickly than in point 1 above. The overlaid numbers in the unity 
launcher will display (which is OK) - and remain there after having released 
the keys (which is not).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
ApportVersion: 1.93-0ubuntu2
Architecture: amd64
CompizPlugins: 
[core,crashhandler,bailer,detection,composite,opengl,decor,regex,vpswitch,mousepoll,move,text,commands,copytex,put,gnomecompat,compiztoolbox,place,imgpng,grid,animation,resize,workarounds,resizeinfo,wall,wobbly,session,expo,fade,ezoom,scale,scaleaddon,unityshell]
Date: Fri Feb 24 00:18:36 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120112)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-02-23 (0 days ago)

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


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/939956

Title:
  Shortcuts containing the <Super> key invoke the unity dash or help
  overlay

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