Comment 5 for bug 847464

valgrind crash with dbgsyms.

(gnome-panel:4699): GLib-GObject-WARNING **: invalid cast from `PanelToplevel' to `GtkOrientable'

(gnome-panel:4699): Gtk-CRITICAL **: gtk_orientable_get_orientation: assertion `GTK_IS_ORIENTABLE (orientable)' failed
==4699==
==4699== Process terminating with default action of signal 8 (SIGFPE)
==4699== Integer divide by zero at address 0x40CD9E3E9
==4699== at 0x17C648D2: wnck_tasklist_size_allocate (tasklist.c:1604)
==4699== by 0x708A1A9: g_closure_invoke (gclosure.c:774)
==4699== by 0x709CCD6: signal_emit_unlocked_R (gsignal.c:3202)
==4699== by 0x70A6B16: g_signal_emit_valist (gsignal.c:3003)
==4699== by 0x70A6CE1: g_signal_emit (gsignal.c:3060)
==4699== by 0x573D966: gtk_widget_size_allocate (gtkwidget.c:4886)
==4699== by 0x556F790: gtk_event_box_size_allocate (gtkeventbox.c:585)
==4699== by 0x17A3E99C: panel_applet_size_allocate (panel-applet.c:1382)
==4699== by 0x708A1A9: g_closure_invoke (gclosure.c:774)
==4699== by 0x709CCD6: signal_emit_unlocked_R (gsignal.c:3202)
==4699== by 0x70A6B16: g_signal_emit_valist (gsignal.c:3003)
==4699== by 0x70A6CE1: g_signal_emit (gsignal.c:3060)