opening menu for certain types of GtkComboBox causes Gdk-CRITICAL assertion 'GDK_IS_WINDOW (window)' failed

Status changed to 'Confirmed' because the bug affects multiple users.

This bug was fixed in the package gtk+3.0 - 3.22.5-1ubuntu1

---------------
gtk+3.0 (3.22.5-1ubuntu1) zesty; urgency=medium

  * Merge with Debian (LP: #1647174). Remaining changes:
    + Install the settings.ini file to set our themes
    + Install a gsettings override to start filechoosers in the cwd
    + Enable Mir backend
    + debian/control.in:
      - Build-depend on adwaita-icon-theme-full for icon name check test
    + debian/rules: Mark additional known test failures:
      - box-shadow-changes-modify-clip.ui
      - label-text-shadow-changes-modify-clip.ui
    + Ubuntu-specific patches:
      - 073_treeview_almost_fixed.patch
      - 074_eventbox_scroll_mask.patch
      - bzg_gtkcellrenderer_grabbing_modifier.patch
      - ubuntu_gtk_custom_menu_items.patch
      - print-dialog-show-options-of-remote-dnssd-printers.patch
      - uimanager-guard-against-nested-node-updates.patch
      - x-canonical-accel.patch
      - message-dialog-restore-traditional-look-on-unity.patch
      - 0001-gtk-reftest-Force-icon-theme-to-Adwaita.patch
      - restore_filechooser_typeaheadfind
      - 0001-calendar-always-emit-day-selected-once.patch
      - 0001-gtkwindow-set-transparent-background-color.patch
      - ubuntu_fileselector_behaviour.patch
      - unity-border-radius.patch
      - unity-headerbar-maximized-mode.patch
  * Drop 'Use dh_strip --dbgsym-migration for proper upgrades'
    added in 3.22.4-1ubuntu1 since there is no file conflict here.
    Anyone with obsolete -dbg packages installed will need to manually
    remove the old -dbg packages, enable the ddebs repository, and
    install the appropriate -dbgsym packages.

gtk+3.0 (3.22.5-1) unstable; urgency=medium

  * New upstream release.

 -- Jeremy Bicha <email address hidden> Sat, 10 Dec 2016 13:52:57 -0500