[Bug 1242801]

[Yyc1992]

With further debugging, the direct reason seems to be a "notify::popup-
shown" signal being emit and changes the stamp in GtkTreeModelFilter in
the path: combo_box_notify_popup_shown_cb ->
gtk_tree_model_filter_refilter -> gtk_tree_model_foreach ->
gtk_tree_model_filter_refilter_helper ->
gtk_tree_model_filter_row_changed ->
gtk_tree_model_filter_increment_stamp

Not sure what is the real reason but setting the stamp back after this
prevent the segfault.

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https://bugs.launchpad.net/bugs/1242801

Title:
  meld assertion while selecting directory

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