Lowering some windows causes other, unrelated windows to also be lowered.

[Andrew]

Steps to reproduce:

  1. Open four windows, each using half of the screen:

                        ┌──C──╥──D──┐
      ┌──A──╥──B──┐     │┌──A─╨╥──B─┴┐
      │     ║     │     ││     ║     │
      │     ║     │     └┤     ║     │
      └─────╨─────┘      └─────╨─────┘
         2D view            3D view

  2. Lower window A.

Expected behavior:

  Window A is lowered:

                        ┌──A──╥──D──┐
      ┌──C──╥──B──┐     │┌──C─╨╥──B─┴┐
      │     ║     │     ││     ║     │
      │     ║     │     └┤     ║     │
      └─────╨─────┘      └─────╨─────┘
         2D view            3D view

Actual behavior:

  Window A and window B are lowered:

                        ┌──A──╥──B──┐
      ┌──C──╥──D──┐     │┌──C─╨╥──D─┴┐
      │     ║     │     ││     ║     │
      │     ║     │     └┤     ║     │
      └─────╨─────┘      └─────╨─────┘
         2D view            3D view

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gnome-shell 3.26.2-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.13.0-30.33-generic 4.13.13
Uname: Linux 4.13.0-30-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 23 07:50:21 2018
DisplayManager: gdm3
InstallationDate: Installed on 2016-09-15 (495 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to artful on 2018-01-21 (2 days ago)

[Andrew (andrewkvalheim)]

See also Launchpad bug #2627, "Non-leading whitespace mangled in bug description and comments".

[Daniel van Vugt (vanvugt)]

Very nice. I fixed the whitespace by editing the description externally and replacing them with non-breaking spaces.

[Daniel van Vugt (vanvugt)]

I am reminded of bug 1729461, although different. I also think there are similar bug reports elsewhere but can't find them.

[Daniel van Vugt (vanvugt)]

Bug confirmed. But to lower a window with middle click you need to be logged into a Xorg session. It doesn't work in Wayland sessions (bug 1698083).

[Daniel van Vugt (vanvugt)]

It looks like this bug might be fixed in mutter 3.26.3 by this:

https://gitlab.gnome.org/GNOME/mutter/commit/415584344a5d4b577321616f1ddeb4c4536253bc

[Launchpad Janitor (janitor)]

This bug was fixed in the package gnome-shell - 3.27.91-0ubuntu1

---------------
gnome-shell (3.27.91-0ubuntu1) bionic; urgency=medium

  [ Didier Roche ]
  * New upstream version (LP: #1751070, LP: #1722725,
    LP: #1714989, LP: #1724557, LP: #1723857, LP: #1744970):
    - debian/patches/70_allow_sound_above_100.patch,
      debian/patches/ubuntu-lightdm-user-switching.patch patches
      refreshed for new release. Removed ': function()' syntax as
      upstreamed removed them in those context.
    - debian/patches/ubuntu_panel_center_date_workarea.patch removed as
      upstreamed now.
    - debian/control.in, debian/rules:
      bump deps, add sassc and libnm-dev which is now required.
      drop caribou dep, as the OSK is now built-in.
    - debian/rules:
      use now with renamed build options.
  * debian/ubuntu-session-mods/ubuntu.css, debian/rules:
    - adapt to new GNOME Shell theme including OSK.
    - color shift keys in orange in OSK and use differente svg.
  * debian/rules:
    - some duplication removal.
  * debian/patches/27-nm-libexec-path.patch,
    debian/patches/71_smarter_alt_tab.patch,
    debian/patches/fix-wayland-vbox-crash.patch,
    debian/patches/optional-hot-corner.patch,
    debian/patches/ubuntu_block_mode_extension_update.patch,
    debian/patches/ubuntu_gdm.patch,
    debian/patches/ubuntu_lock_on_suspend.patch:
    - unfuzzed
  * Cherry-pick git_ea0770ae22a6c34797db4343cf7d2f59bb8d68f6.patch:
    - upstream mutter API bump.
  * debian/gnome-shell-common.install, debian/rules:
    - the .css files aren't shipped anymore, so copy from the built version.

  [ Jeremy Bicha ]
  * Update NetworkManager dependencies

 -- Didier Roche <email address hidden> Fri, 02 Mar 2018 10:04:06 +0100

[Daniel van Vugt (vanvugt)]

Surprisingly not fixed(!?)

Tested on:
gnome-shell (3.27.91-0ubuntu1)
mutter (3.27.91-1)

[Daniel van Vugt (vanvugt)]

Looks like upstream just noticed. This fix went in AFTER 3.27.92 ...

commit 00b8ca7aebbd7c2288716dff2d04d0e75be523ac
Author: Georges Basile Stavracas Neto <email address hidden>
Date: Thu Dec 14 11:38:54 2017 -0200

    Revert "window: Raise and lower tile match in tandem"

    Raising and lowering windows in tandem without a proper grouping
    mechanism ended up being more annoying than functional.

    This reverts commit e76a0f564c1e07e32fe857d0f8e5b723c3bbe57d.

[Daniel van Vugt (vanvugt)]

Fix released in mutter 3.28.0