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[Cui Wei <ghostplant@xxxxxx>]

I guess that when I hide or close a certain window, metacity has a
possiblity to "hide all window".

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https://bugs.launchpad.net/bugs/1538111

Title:
  untraceable serious bug in metacity 3.18

Status in metacity package in Ubuntu:
  New

Bug description:
  Ubuntu 16.04 LTS uses 3.18 version of gnome metacity.

  When doing lots of mess work in Desktop (such as open desktop window,
  sudo window, dragging window, and so on), "!! WHEN CLICKING CLOSE
  BUTTON OF A CERTAIN WINDOW !!", there is "small possibility" for
  metacity to get out of work --> Many windows are disappeared, with
  only nautilus desktop background and gnome-panel on screen. "Live
  Window List" still exists in gnome-panel, but no matter doing what
  (such as open new application from gnome-menu or use Alt+Tab to switch
  window), none of live windows can be displayed.

  So the only way is to switch to tty1 using Ctrl+Alt+F1, and executing
  "DISPLAY=:0 metacity -c --replace", then all windows came back.

  Till now, I meet this bug every day, but still not sure how to
  reproduce it bug. I think you should trace what the metacity do when
  clicking "close button" that makes all windows to be disappeared.

  Thanks.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: metacity 1:3.18.1-1ubuntu3
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  ApportVersion: 2.19.3-0ubuntu3
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Tue Jan 26 19:49:48 2016
  SourcePackage: metacity
  UpgradeStatus: No upgrade log present (probably fresh install)

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