Bug#806372: soundconverter: add files window does not filter results

[Rock Storm]

Package: soundconverter
Version: 3.0.0~alpha1+git20151119-1
Severity: normal

Dear Maintainer,

In the "Add Files" window, whenever trying to filter results by file type, say
".m4a" or ".ogg", no matter what filetype I choose it does not apply the filter
plus I get the following lines in the terminal:

Traceback (most recent call last):
  File "/usr/share/soundconverter/python/soundconverter/ui.py", line 1116, in on_combo_changed
    filefilter.add_custom(Gtk.FILE_FILTER_DISPLAY_NAME, self.filter_cb,
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 39, in __getattr__
    return getattr(self._introspection_module, name)
  File "/usr/lib/python3/dist-packages/gi/module.py", line 137, in __getattr__
    self.__name__, name))
AttributeError: 'gi.repository.Gtk' object has no attribute 'FILE_FILTER_DISPLAY_NAME'

I think the above error might be related to some other messages I am getting
when itializing soundconverter:

rock at rocko:~$ soundconverter 
SoundConverter 2.9.0-beta1
  using GTK version: 3.0
  using Gstreamer version: 1.6.1.0
  using 4 thread(s)
/usr/share/soundconverter/python/soundconverter/gstreamer.py:28: PyGIWarning: GConf was imported without specifying a version first. Use gi.require_version('GConf', '2.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gst, Gtk, GObject, GConf, Gio
/usr/share/soundconverter/python/soundconverter/notify.py:30: PyGIWarning: Notify was imported without specifying a version first. Use gi.require_version('Notify', '0.7') before import to ensure that the right version gets loaded.
  from gi.repository import Notify
  using gio
  "faac" gstreamer element not found, disabling AAC output.
[]
[]
/usr/share/soundconverter/python/soundconverter/ui.py:1488: Warning: g_value_type_transformable: assertion 'G_TYPE_IS_VALUE (src_type)' failed
  builder.add_from_file(gladefile)

(python3:1594): Gtk-WARNING **: /build/gtk+3.0-bNySRH/gtk+3.0-3.18.5/./gtk/gtkliststore.c:836: Unable to convert from (null) to gchararray

/usr/share/soundconverter/python/soundconverter/ui.py:1488: Warning: g_value_unset: assertion 'G_IS_VALUE (value)' failed
  builder.add_from_file(gladefile)

(python3:1594): Gtk-WARNING **: Content added to the action area of a dialog using header bars

(python3:1594): Gtk-WARNING **: Content added to the action area of a dialog using header bars 

Thanks in advance,
Rock

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages soundconverter depends on:
ii  gir1.2-gconf-2.0           3.2.6-3
ii  gir1.2-glib-2.0            1.46.0-2
ii  gir1.2-gstreamer-1.0       1.6.1-1
ii  gir1.2-gtk-3.0             3.18.5-1
ii  gstreamer1.0-plugins-base  1.6.1-1
ii  gstreamer1.0-plugins-good  1.6.1-1
ii  python3-gi                 3.18.2-2
pn  python3:any                <none>

soundconverter recommends no packages.

Versions of packages soundconverter suggests:
ii  gstreamer1.0-libav         1.6.1-1
ii  gstreamer1.0-plugins-ugly  1.6.0-1

-- no debconf information