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[pabouk <741869@xxxxxxxxxxxxxxxxxx>]

The behaviour is much better after patching but for example in VMware
Workstation (or Player) some problems persist:

When the keyboard is grabbed (mouse is in the window of a VM with VMware
Tools) and the keys (Super or Alt) are pressed nothing happens in Unity
as expected. But when the keyboard is ungrabbed (mouse leaves the
window) shortly after the keypress Unity behaves as if the key was
pressed again.

Test case:
1. In VMware Workstation (or Player) start a VM with VMware Tools installed.
2. Move the mouse cursor inside the window of the VM.
3. Press Super or Alt.
4. In less than 2 seconds move the mouse cursor outside of the window.
5. Nothing should happen in Unity but Unity actually behaves as if the key (Super or Alt) was pressed again.

It seems that there is a timeout for this behaviour. When the keyboard
is ungrabbed after more than approximately 3 seconds then nothing
happens in Unity as expected.

Alternative test case (does not require VMware Tools but is not so annoying.):
1. In VMware Workstation (or Player) start a VM.
2. Grab the keyboard in the VM (Ctrl+G or mouse click).
3. Press Alt. (Super does not demonstrate this problem completely in this variant.)
4. In less than 2 seconds ungrab the kyboard by pressing Ctrl+Alt.
5. Nothing should happen in Unity but Unity actually behaves as if the key (Alt) was pressed again. (With Super Dash only flashes shortly.)

...but since this problem does not show up when the VM is in full screen
mode then it seems that the bugfix in Unity behaves correctly as
described in this case.

-- 
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https://bugs.launchpad.net/bugs/741869

Title:
  Unity/compiz intercepts Super and Alt keypresses from grabbed windows
  like VMs.

Status in Ayatana Design:
  Fix Committed
Status in Compiz:
  Triaged
Status in Compiz Core:
  Triaged
Status in OEM Priority Project:
  Won't Fix
Status in OEM Priority Project precise series:
  Won't Fix
Status in Unity:
  Fix Released
Status in Unity 7.2 series:
  Fix Released
Status in “compiz” package in Ubuntu:
  Triaged
Status in “unity” package in Ubuntu:
  Fix Released
Status in “compiz” source package in Trusty:
  Confirmed
Status in “unity” source package in Trusty:
  Fix Released

Bug description:
  [Impact]
  After upgrading from Maverick to Natty, I can no longer use the Super (windows) key in Virtual Machine Manager. Previously, as long as I had the Virtual Machine Manager console window in the foreground, I could press the Super key and the start menu would pop up. Since upgrading to Natty, this no longer works, and the search box appears in the upper left.

  Also see bug #934921

  [Test Case]
  (1) Install virtualbox or virt-manager and qemu-system, create and boot a virtual machine
  (2) while in the virtual machine (and it should grab the keyboard), press the Super key
  Expected Result: the super key acts inside the VM (check by install unity on it or using xev)
  Buggy Result: the super key acts in the host and the Unity Dash is displayed

  [regression Potential]This patch plays with key grabs and ungrabs:
  the most likely potential for regression is (a) the existing grabs
  continue and no fix obtains or (2) the grab is not resumed when
  returning control from the VM and the Super key does not invoke the
  Unity Dash.

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