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[Launchpad Bug Tracker <1614050@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package metacity - 1:3.18.7-0ubuntu0.2

---------------
metacity (1:3.18.7-0ubuntu0.2) xenial; urgency=medium

  * Backport upstream commits to fix stack order handling when windows
    are unmapped (no_remove_on_unmap.diff, LP: #1614050).

 -- Dmitry Shachnev <mitya57@xxxxxxxxxx>  Mon, 31 Oct 2016 15:49:42
+0300

** Changed in: metacity (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1614050

Title:
  Window depth order messed up

Status in metacity package in Ubuntu:
  Fix Released
Status in metacity source package in Xenial:
  Fix Released

Bug description:
  # Test Case
  Described in comment https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/1614050/comments/16

  # Impact
  Sometimes the window depth order is wrong, for example the desktop icons appear above all windows. Also sometimes windows disappear and the only way to bring them back to life is restarting Metacity. This can result in loss of work results for users who do not know how to deal with this bug.

  # Fix
  The Xenial fix is composed of two upstream commits, in gnome-3-18 branch:
  - https://git.gnome.org/browse/metacity/commit/?id=d5f9e42e30c67d07
  - https://git.gnome.org/browse/metacity/commit/?id=72488dc76ee24a3e

  # Regression Potential
  The patch has been in Yakkety for almost a month, and nobody complained.
  [bdmurray] - That's not a description of what could go wrong, rather one of what hasn't gone wrong in Yakkety.  Please add some possible regressions and what users testing this fix should look out for.

  =============================================================================
  Using the gome-flashback session with metacity is totally messed up since I updated from Ubuntu 14.04.3 to 16.04.1.

  All the effects mentioned here do not appear when using compiz, so I
  guess Metacity is broken.

  -Windows that should open in front (like Kupfer) appear behind the
  windows already open.

  -Before nemo is run, the Ubuntu default desktop background image
  appear, it can't be changed by settings. I just guess this is due
  wrong ordering of the true background and some window used by Gnome
  for showing the selected background.

  -If nemo is run to take over the desktop, the destkop icons appear in
  front of all windows.

  I guess all those effects originate from a similiar reason. None of
  these problems where appearant at Ubuntu 14.04.

  This is a total show stopper for using metacity on 16.04 as everyday
  applications like nemo and Kupfer can't be used.

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