Public bug reported:

When executing the following program, the whole session crashes and I
need to log in again:


#!/usr/bin/env python
import logging
import signal


from gi.repository import Gdk
from gi.repository import Gtk, GLib


class App(Gtk.Application):

    def __init__(self):
        Gtk.Application.__init__(
            self, application_id=None)
        self.connect("activate", self.on_activate)
        self.connect("startup", self.on_startup)

        self.log = logging.getLogger()
        self.log = logging


    def on_startup(self, app):
        self.log.info("Startup")
        self.window = Gtk.ApplicationWindow(application=app)

        lt = Gtk.TextView()

        def add_text(text='foo', widget=lt):
            buffer = widget.get_buffer()
            buffer.set_text(text * 1000)
        
        add_text()    
        self.window.add(lt)


    def on_quit(self, app, param=None):
        self.quit()


    def on_activate(self, app):
        self.log.info("Activate!")
        self.window.show_all()


def main():
    app = App()

    try:
        GLib.unix_signal_add_full(GLib.PRIORITY_HIGH, signal.SIGINT, lambda 
*args : app.quit(), None)
    except AttributeError:
        pass

    app.run()

if __name__ == '__main__':
    main()

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: gnome-shell 3.14.4-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Apr 29 10:49:28 2015
DisplayManager: gdm
GsettingsChanges:
 b'org.gnome.shell.calendar' b'show-weekdate' b'true'
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
 b'org.gnome.desktop.interface' b'clock-show-date' b'true'
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1449913

Title:
  the whole gnome-shell crashes when asking for a very wide window

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