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[Khurshid Alam <khurshid.alam@xxxxxxxxxxxxx>]

I can now reproduce this with Gtk-3.14 on Vivid as well.

** Summary changed:

- 'Show Desktop' on launcher crashes compiz for any Gtk-Headerbar app when using any third party Gtk(3.12) theme (Utopic/Vivid)
+ 'Show Desktop' on launcher crashes compiz for any Gtk-Headerbar app when using any third party Gtk(3.12/3.14) theme (Utopic/Vivid)

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https://bugs.launchpad.net/bugs/1387163

Title:
  'Show Desktop' on launcher crashes compiz for any Gtk-Headerbar app
  when using any third party Gtk(3.12/3.14) theme (Utopic/Vivid)

Status in Unity:
  Confirmed
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  This is happening for any gtk-3.12 theme which has proper support for
  gtk-headerbar.

  How to reproduce on Utopic:

  1. sudo apt-get install Numix
  2. sudo apt-get install gnome-tweak-tool
  3. change Gtk theme to Numix
  4. Open any app with Gtk-Headerbar (& NOT directly patched by Ubuntu) like gnome-tweak-tool, gnome-system-log
  2. enable show-desktop on unity launcher
  3. Click on show-desktop first time. it will show desktop.
  4. Click on it again, it crashes compiz & sometimes does not recover from it. Users have to fallback to TTY  & force restart lightdm.

  The problem also occurs for any headerbar app from Gnom3 ppa (for
  example gnome-contacts, baobab, gnome-maps).

  Attached crash file from /var/crash/compiz.

  Note: Compiz on other desktop shell/session works relatively well. For
  example in Gnome-Flashback-Compiz session it doesn't happen.

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