Experiencing this problem developing PyQt5 applications, in regards to
QTextEdit items. Currently the only fix is to use a non-native style.
See here: http://stackoverflow.com/questions/35351024/pyqt5-gtk-
critical-ia-gtk-widget-style-get-assertion-gtk-is-widget-widg

Any ideas of how related these issues are?

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https://bugs.launchpad.net/bugs/805303

Title:
  Gtk-CRITICAL **: IA__gtk_widget_style_get: assertion `GTK_IS_WIDGET
  (widget)' failed with the default qt4 gui

Status in Ubuntu:
  Fix Released
Status in qt4-x11 package in Ubuntu:
  Fix Released
Status in xorg-server package in Ubuntu:
  Invalid
Status in The Oneiric Ocelot:
  Fix Released
Status in qt4-x11 source package in Oneiric:
  Fix Released
Status in xorg-server source package in Oneiric:
  Invalid

Bug description:
   vlc will hang when trying to open anything additional -  it also appears to 
crash unity-window-decorator among other things (have crash report on that)
  Ex.'s - the playlist, tools > preferences and so forth

  Switching the qt4 gui to anything but 'default' (gtk+) in qtconfig-qt4
  and it works without incidence (tooltips are empty bit otherwise
  good).

  Will attach xsession.errors, reflects a login, opening vlc, opening 
xsession.errors, then attempting to open playlist window in vlc.
  (using nvidia-current)

  Note to Vlc users - I've found clearlooks to be best choice, should be
  good for other apps as well. Also do as mentioned in comment 13

  Note to Anki users - please review comments 20, 22 for current
  workaround

  This happens with many Qt4 and PyQt4 applications.
  Some errors displayed (from comments 16 and 18):

  (python:2901): Gtk-CRITICAL **: IA__gtk_widget_style_get: assertion 
`GTK_IS_WIDGET (widget)' failed
  (python:2901): Gtk-CRITICAL **: IA__gtk_widget_style_get: assertion 
`GTK_IS_WIDGET (widget)' failed

  QWidget::setMinimumSize: (/MainWindow) The largest allowed size is
  (16777215,16777215)

  X Error: BadDrawable (invalid Pixmap or Window parameter) 9
    Major opcode: 62 (X_CopyArea)
    Resource id: 0x0
  X Error: BadAlloc (insufficient resources for operation) 11
    Major opcode: 53 (X_CreatePixmap)
    Resource id:  0x15a
  X Error: BadDrawable (invalid Pixmap or Window parameter) 9
    Extension:    152 (RENDER)
    Minor opcode: 4 (RenderCreatePicture)
    Resource id:  0x42004f6
  X Error: RenderBadPicture (invalid Picture parameter) 174
    Extension:    152 (RENDER)
    Minor opcode: 8 (RenderComposite)
    Resource id:  0x42004f6
  X Error: BadPixmap (invalid Pixmap parameter) 4
    Major opcode: 54 (X_FreePixmap)
    Resource id:  0x42004f6

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: vlc 1.1.10-1ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-9.43lp760131v201106060906-generic 2.6.38.7
  Uname: Linux 2.6.38-9-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Sun Jul  3 23:23:42 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110202)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: vlc
  UpgradeStatus: Upgraded to oneiric on 2011-07-03 (1 days ago)

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