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[Bug 1305586] Re: Lock screen is unusable when some windows have a keyboard/mouse grab


** Description changed:

+ [Impact]
+ Some windows will grab the keyboard/mouse and when the lockscreen kicks
+ in, this window will still have the grab and thusly, ou can enter your
+ password in the lockscreen.
+ [Test case]
+ 1. Open a window that will hold the grab, such as the ssh password dialog.
+ 2. Wait for the lock screen to activate.
+ 3. Enter your password to unlock the screen.
+ [Regression potential]
+ This particular fix doesn't fix all cases, but does fix it for some.
+ That said, no new regressions are expected.
+ Original Description:
  My screen just timed out and locked when a password prompt which had a
  grab was displaying.
  I couldn't type my password or interact with the indicators.
  gnome-screensaver just refuses to lock in this situation, perhaps unity
  could do the same unless it's possible to remove and readd the grabs
  yourself, but I don't think XLib lets you do that (you can only remove
  your own grabs AFAIK).
  Click on the guest session
  Once the guest session is started log out
  This takes you back to the lightdm session screen you can then login to your user session and it be in the same state
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.0+14.04.20140409-0ubuntu1 [origin: unknown]
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  Uname: Linux 3.13.0-23-generic x86_64
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CrashDB: unity
  CurrentDesktop: Unity
  Date: Thu Apr 10 09:39:45 2014
  InstallationDate: Installed on 2012-10-07 (549 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20121007)
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2013-05-07 (338 days ago)

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  Lock screen is unusable when some windows have a keyboard/mouse grab

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