Correction, I am running Ubuntu 18.10, not 18.04.

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https://bugs.launchpad.net/bugs/1814169

Title:
  Mutter upsteam bug: cannot overwrite workspaces layout

Status in mutter package in Ubuntu:
  Fix Released

Bug description:
  Running up-to-date Ubuntu Cosmic. Since I am running a version with
  manually applied patched from below, I couldn't use the ubuntu-bug
  helper.

  Bug: When using GNOME extension “Workspace grid” that arranges
  workspaces in a grid, one can find that horizontal switch animation is
  replaced with a vertical one. This is caused by a bug in mutter
  itself, it's acknowledged and fixed in upsteam. Applying the patch for
  the current version in Ubuntu solves the issue as well.

  GIFs of the issue could be found here: https://medium.com/@hkdb/patch-
  gnome-3-30-for-workspace-grid-1ee8b1dd92f9.

  Upstream bug: https://gitlab.gnome.org/GNOME/mutter/issues/270.
  Upsteam fix: 
https://gitlab.gnome.org/rmyorston/mutter/commit/97a3a9b24b36111155003467d5fac6bb1ec1c60e
 (merged into master 3 months ago).

  The patch to fix is, literally, adding 1 meaningful line:

  From 86a719cc78149b7db189ff7e5d1f16418d257e9e Mon Sep 17 00:00:00 2001
  From: Ron Yorston <r...@pobox.com>
  Date: Tue, 2 Oct 2018 12:47:05 +0100
  Subject: [PATCH] Allow workspace layout to be overridden

  meta_workspace_manager_override_workspace_layout is implemented by
  calling meta_workspace_manager_update_workspace_layout which
  respects the workspace_layout_overridden flag.  After the first call
  to meta_workspace_manager_override_workspace_layout all subsequent
  calls fail silently.

  Reset workspace_layout_overridden to FALSE before calling
  meta_workspace_manager_update_workspace_layout.

  Signed-off-by: Ron Yorston <r...@pobox.com>
  ---
   src/core/meta-workspace-manager.c | 2 ++
   1 file changed, 2 insertions(+)

  diff --git a/src/core/meta-workspace-manager.c 
b/src/core/meta-workspace-manager.c
  index 2670f4938..abc819db0 100644
  --- a/src/core/meta-workspace-manager.c
  +++ b/src/core/meta-workspace-manager.c
  @@ -496,6 +496,8 @@ meta_workspace_manager_override_workspace_layout 
(MetaWorkspaceManager *workspac
                                                     int                   
n_rows,
                                                     int                   
n_columns)
   {
  +  workspace_manager->workspace_layout_overridden = FALSE;
  +
     meta_workspace_manager_update_workspace_layout (workspace_manager,
                                                     starting_corner,
                                                     vertical_layout,
  -- 
  2.17.1

  Hopefully this one is fast to test and apply ;)

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