Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xorg (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1565541

Title:
  Focused window is not always brought to front

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  The following steps will systematically reproduce the issue. Terminal
  is only an example, you can do the same with any other application
  that can open multiple windows.

  - open three terminal windows
  - hit Ctrl+Super+D to show the Desktop. All windows disappear as expected
  - click on the Terminal icon in Launcher. One of the three windows is 
selected and brought to front as expected
  - click on the Terminal icon again
  - when presented with the three miniature windows, click on any of them 
except the one you previously selected

  Expected result: the selected terminal window should get focus AND be
  brought to front

  Observed result: the selected window is given focus but is not brought
  to front. Instead, another random one of the three is brought to
  front.

  The mere fact that the focused window is not the one on the top of the
  stack (i.e. the one most on the front) is in itself an inconsistency
  that should never exist and should be forbidden at the lowest
  conceivable level.

  Note that this is a HUGE SECURITY ISSUE and as such should be marked
  as critical. You can be typing (or sending keystrokes) into a window
  without even seeing it.

  Since one window is brought to front, you may not realise that it is
  not focused (though you can tell the difference  if you look at it
  carefully enough), and hence you may for example hit several keys
  including Enter thinking that the selected windows is not responding,
  while infact your keystrokes are all processed by the invisible
  focused window. You may do random stuff on the invisible focused
  window. You could *literally* (and I'm not abusing the word
  "literally") wipe out your hard drive or publish your password on
  Facebook; or more likely, delete files or do all kind of irreversible
  damages to some document of yours.

  Note that I reported a somewhat similar issue where a random window is
  focused instead of the clicked one but that's a different bug (it
  still happens, but I don't know how to reproduce it systematicall),
  and another one regarding the focused window not having the title bar
  and borders, but that's different too and that particular one seems to
  be fixed.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
  Uname: Linux 4.2.0-34-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.96  Sun Nov  8 22:33:28 
PST 2015
   GCC version:  gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2)
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Apr  3 21:38:07 2016
  DistUpgraded: 2016-01-18 11:11:01,146 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0647]
   NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 
620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691]
  InstallationDate: Installed on 2013-10-11 (905 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Acer Aspire V3-571G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-34-generic.efi.signed 
root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to wily on 2016-01-18 (76 days ago)
  dmi.bios.date: 10/15/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V2.07
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: VA50_HC_CR
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.07
  dmi.modalias: 
dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07:
  dmi.product.name: Aspire V3-571G
  dmi.product.version: V2.07
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.12.2+15.10.20151202-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11-1ubuntu3
  xserver.bootTime: Fri Apr  1 21:24:50 2016
  xserver.configfile: /etc/X11/xorg.conf
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9.1

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