ogmrip crash with "gtk_file_system_model_sort: assertion failed: (r == n_visible_rows)"

I ran ogmrip in gdb; this is the backtrace.

Gtk:ERROR:/build/buildd/gtk+2.0-2.24.4/gtk/gtkfilesystemmodel.c:746:gtk_file_system_model_sort: assertion failed: (r == n_visible_rows)

Program received signal SIGABRT, Aborted.
0x00007ffff4d5ed05 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ffff4d5ed05 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff4d62ab6 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ffff534551d in g_assertion_message ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007ffff5345ae0 in g_assertion_message_expr ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007ffff6bf4d6a in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#5 0x00007ffff6bf6ab8 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#6 0x00007ffff6bf6bc0 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#7 0x00007ffff4a64cc8 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#8 0x00007ffff531fbcd in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007ffff53203a8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007ffff53209f2 in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007ffff6c38af7 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#12 0x00000000004187fb in main ()
(gdb)

libgtk doesn't seem to have any proper symbols, so this is probably of limited value. :(

I installed the dbg version of libgtk, and re-ran ogmrip in gdb. This time I got a slightly better looking backtrace:

[New Thread 0x7fffe7f06700 (LWP 11692)]
**
Gtk:ERROR:/build/buildd/gtk+2.0-2.24.4/gtk/gtkfilesystemmodel.c:746:gtk_file_system_model_sort: assertion failed: (r == n_visible_rows)

Program received signal SIGABRT, Aborted.
0x00007ffff4d5ed05 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ffff4d5ed05 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff4d62ab6 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ffff534551d in g_assertion_message ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007ffff5345ae0 in g_assertion_message_expr ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007ffff6bf4d6a in gtk_file_system_model_sort (model=0xa3e0d0)
    at /build/buildd/gtk+2.0-2.24.4/gtk/gtkfilesystemmodel.c:746
#5 0x00007ffff6bf6ab8 in _gtk_file_system_model_update_file (model=0xa3e0d0,
    file=0x1010b60, info=0x109aed0, requires_resort=1)
    at /build/buildd/gtk+2.0-2.24.4/gtk/gtkfilesystemmodel.c:1786
#6 0x00007ffff6bf6bc0 in gtk_file_system_model_query_done (
    object=<value optimized out>, res=<value optimized out>, data=0xa3e0d0)
    at /build/buildd/gtk+2.0-2.24.4/gtk/gtkfilesystemmodel.c:1154
#7 0x00007ffff4a64cc8 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#8 0x00007ffff531fbcd in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007ffff53203a8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007ffff53209f2 in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007ffff77b7546 in ?? () from /usr/lib/libogmjob.so.1
---Type <return> to continue, or q <return> to quit---
#12 0x00007ffff77b8284 in ogmjob_cclosure_marshal_INT__VOID ()
   from /usr/lib/libogmjob.so.1
#13 0x00007ffff55da765 in g_closure_invoke ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007ffff55ebe1f in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007ffff55f4fa9 in g_signal_emit_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007ffff55f541f in g_signal_emit ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#17 0x00007ffff77b8d4c in ogmjob_spawn_run () from /usr/lib/libogmjob.so.1
#18 0x00007ffff77b89a5 in ?? () from /usr/lib/libogmjob.so.1
#19 0x00007ffff77b8284 in ogmjob_cclosure_marshal_INT__VOID ()
   from /usr/lib/libogmjob.so.1
#20 0x00007ffff55da765 in g_closure_invoke ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007ffff55ebe1f in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#22 0x00007ffff55f4fa9 in g_signal_emit_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#23 0x00007ffff55f541f in g_signal_emit ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#24 0x00007ffff77b8d4c in ogmjob_spawn_run () from /usr/lib/libogmjob.so.1
#25 0x00007ffff77b67dc in ?? () from /usr/lib/libogmjob.so.1
#26 0x00007fffebfa183d in ?? ()
   from /usr/lib/ogmrip/video-plugins/libogmrip-xvid.so
#27 0x00007ffff77b8284 in ogmjob_cclosure_marshal_INT__VOID (...

I added some more information I extracted from gdb.

Note the following:
$ grep -c "visible = 1" model-nodes-array.txt
41

That is the same number as n_visible_rows.

I'm not sure I understand 100% what gtk_file_system_model_sort() is trying to do, but it seems a bit fishy that r is incremented for each time in the loop, even if the node is not visible. My intuition is that r will end up being the total number of nodes, not the number of visible nodes, and that this might very well be larger than the number of visible nodes. (As I believe it in fact is in my crash.) But I'm not sure about the origin of the n_visible_rows; it comes from:
  n_visible_rows = node_get_tree_row (model, model->files->len - 1) + 1;
so depending on how the model data structure should look, it might very well be correct.

Also, I also noted that the call to this function reads:

  /* FIXME: improve */
  gtk_file_system_model_sort (model);

In my experience, finding a "FIXME" close to a place where a crash/assert happened is a prime suspect.

This is probably how far I can take this; I don't have anymore gtk experience and not much more time debugging it either, unfortunately. If you need more info, I can probably re-create the situation quite easily, though. (Happens far too often when i run ogmrip. :-()

Also, it seems to me now that this is a bug in libgtk, not in ogmrip. I'm not sure if it is possible to reassign the bug in launchpad..? I can't find a way to do it anyway, but perhaps someone can help.