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[POJAR GEO <903302@xxxxxxxxxxxxxxxxxx>]

Confirmed in ubuntu 14.04 -14.10 - 15.04 (x86 and x86-64).

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https://bugs.launchpad.net/bugs/903302

Title:
  Dialog windows are not turning modal anyway

Status in a fast and powerful GTK+ based mail client:
  Invalid
Status in Overlay Scrollbar:
  New
Status in overlay-scrollbar package in Ubuntu:
  Confirmed

Bug description:
  When I create any GtkDialog in my application, i set these two
  methods: set_transient_for(parent_window) and set_modal(true), so I
  can block any interaction with the app until close the dialog. This
  approach works very good except when any child dialog widget uses
  scrollbars, for example, GtkFileChooserWidget or GtkScrolledWindow.
  This time, when I run dialog, some widgets from parent window, as
  GtkButton or GtkComboBox, are not blocking interaction. To reproduce,
  run this python script:

  #!/usr/bin/python
  from gi.repository import Gtk

  def button_on_clicked(button, parent):
      fch = Gtk.FileChooserDialog()
      fch.set_transient_for(parent)
      fch.set_modal(True)
      fch.show_all()
      fch.run()

  win = Gtk.Window()
  btn = Gtk.Button("Click me!")
  win.add(btn)
  btn.connect('clicked', button_on_clicked, win)
  win.set_position(Gtk.WindowPosition.CENTER)
  win.show_all()
  win.connect('destroy', Gtk.main_quit)
  Gtk.main()

  When I uninstall the overlay-scrollbar and liboverlay-scrollbar*
  packages, and restart unity/gnome-shell, the overlay are disabled and
  the problem is gone. Run the script above with and without overlay
  scrollbars and compare results. The issue can be reproduced in C++ and
  Python wrappers to GTK3 (gtkmm-3 and gi.repository.Gtk, respectively).
  I believe this is an overlay scrollbars issue with GTK3, reproduzible
  with pure C GTK3 or any GTK3 wrapper. I don't know if this issue
  affects GTK2.

  The workaround for me is disable overlay scrollbars to solve my issue.

  vinicius@OneiricLinux:~$ lsb_release -rd
  Description:	Ubuntu 11.10
  Release:	11.10

  vinicius@OneiricLinux:~$ apt-cache policy overlay-scrollbar 
  overlay-scrollbar:
    Instalado: (nenhum)
    Candidato: 0.2.11-0ubuntu1
    Tabela de versão:
       0.2.11-0ubuntu1 0
          500 http://br.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages

  What I expected to happen: setting any child dialog modal property to true, all parent window widgets would be blocked.
  What happened: some widgets, GtkButton, GtkComboBox, are not blocking.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: overlay-scrollbar (not installed)
  ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
  Uname: Linux 3.0.0-14-generic x86_64
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  Date: Mon Dec 12 15:18:17 2011
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  ProcEnviron:
   LANGUAGE=pt_BR:pt:en
   PATH=(custom, no user)
   LANG=pt_BR.UTF-8
   SHELL=/bin/bash
  SourcePackage: overlay-scrollbar
  UpgradeStatus: No upgrade log present (probably fresh install)

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