[Bug 1242801] [NEW] meld assertion while selecting directory

[Andreas Roth]

Public bug reported:

I installed saucy with version 1.3.4-0ubuntu1 of gtk2-engines-oxygen and meld version 1.8.2 on Kubuntu/KDE.
- set GTK2 theme to oxygen-gtk in system settings
- Start meld
- on start screen (new comparsion) select directory comparison
- select in either source or destination directory combo box the entry 'Other...'
- crash

in the terminal i could see the callstack of the crash:
/usr/bin/meld:167: GtkWarning: gtk_tree_model_filter_get_value: assertion 'GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp' failed
  gtk.main()
/usr/bin/meld:167: Warning: /build/buildd/glib2.0-2.38.0/./gobject/gtype.c:4215: type id '0' is invalid
  gtk.main()
/usr/bin/meld:167: Warning: can't peek value table for type '<invalid>' which is not currently referenced
  gtk.main()
Segmentation fault

I also tried with version 1.4.0-0ubuntu1 of gtk2-engines-oxygen with the same result. 
If I select a QtCurve as gtk2 theme the same crash occurs. If i select a different theme (e.g. Clearlooks) i get the file dialog and everything is ok.

Today i tested this issue on a raring machine and i was unable to
reproduce this issue there.

** Affects: gtk2-engines-oxygen (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  meld assertion while selecting directory

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