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[Bug 1705060] [NEW] gtk-window-decorator crashed when windows controls are on the left and GDK_SCALE=2


Public bug reported:

On Ubuntu MATE 17.10 daily I am experimenting with GDK scaling. I have
exported the following in to the XSession:


MATE Tweak can be used to switch between window managers and also select
if windows controls are displayed on the left or the right.

  * When window controls are on the right switching to Compiz works just fine.
  * When window controls are on the left switching (or starting Compiz) segfaults with the following error:

(gtk-window-decorator:2990): libmetacity-ERROR **: Could not find a
button to strip. n_left = 1 n_right = -1

ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: compiz-gnome 1:
ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8
Uname: Linux 4.11.0-10-generic x86_64
ApportVersion: 2.20.5-0ubuntu5
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Jul 18 14:22:39 2017
ExecutablePath: /usr/bin/gtk-window-decorator
InstallationDate: Installed on 2017-06-10 (37 days ago)
InstallationMedia: Ubuntu-MATE 17.10 "Artful Aardvark" - Alpha amd64 (20170606)
ProcCmdline: /usr/bin/gtk-window-decorator
 PATH=(custom, no user)
Signal: 5
SourcePackage: compiz
 () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_log_writer_default () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_log_structured_array () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_log_structured () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
 () at /usr/lib/x86_64-linux-gnu/libmetacity.so.1
Title: gtk-window-decorator crashed with signal 5
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirt lpadmin plugdev sambashare sudo

** Affects: compiz (Ubuntu)
     Importance: Medium
         Status: New

** Tags: amd64 apport-crash artful compiz-0.9

** Information type changed from Private to Public

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