This warning started showing up in 2013 when the gtk devs decided to push 
for the standard usage of requiring a parent -- maybe they have future
modifications in mind which require this.  Anyway, the march goes: 
"discouraged",
"deprecated", and finally "removed",  so this warning shouldn't be ignored.
Any number of packages may be affected beyond the two indicated in this bug.
Hopefully,  zenity is an intermediate to the underlying gtk so fixing zenity
may fix the warning in many packages.   Any feedback to the gtk developers on
the number of adversely affected packages might be useful -- they may decide
to allow some environment variable to continue to allow this.

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https://bugs.launchpad.net/bugs/1467588

Title:
  Gtk-Message: GtkDialog mapped without a transient parent. This is
  discouraged. Gtk-Message: GtkDialog mapped without a transient parent.
  This is discouraged.  (process:17035): GLib-CRITICAL **:
  g_slice_set_config: assertion 'sys_page_size == 0' failed

Status in Unity:
  Expired
Status in synaptic package in Ubuntu:
  Confirmed
Status in unity package in Ubuntu:
  Confirmed
Status in zenity package in Ubuntu:
  Confirmed

Bug description:
  Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
  Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

  (process:17035): GLib-CRITICAL **: g_slice_set_config: assertion
  'sys_page_size == 0' failed

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: unity 7.3.2+15.04.20150420-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
  Uname: Linux 3.19.0-21-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Mon Jun 22 16:56:16 2015
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.26, 3.19.0-18-generic, x86_64: installed
   virtualbox, 4.3.26, 3.19.0-20-generic, x86_64: installed
   virtualbox, 4.3.26, 3.19.0-21-generic, x86_64: installed
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1854]
  InstallationDate: Installed on 2015-06-02 (20 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Hewlett-Packard HP 2000 Notebook PC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-21-generic 
root=UUID=9ac32e8e-1bbd-4aa9-8f25-2b79e4052d96 ro quiet splash
  SourcePackage: unity
  UdevLog: Error: [Errno 2] Aucun fichier ou dossier de ce type: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  XorgConf:
   
  dmi.bios.date: 06/13/2013
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.3A
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 1854
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 64.2A
  dmi.chassis.asset.tag: 5CG3400HTV
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsyde:bvrF.3A:bd06/13/2013:svnHewlett-Packard:pnHP2000NotebookPC:pvr088F130000005910000600000:rvnHewlett-Packard:rn1854:rvr64.2A:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP 2000 Notebook PC
  dmi.product.version: 088F130000005910000600000
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917-1~exp1ubuntu2.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.11-1ubuntu2build1
  xserver.bootTime: Mon Jun 22 15:28:27 2015
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 845 
   vendor                                     LGD
  xserver.version: 2:1.17.1-0ubuntu3

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