6b5dce2c66
We not only need to make sure the iterator remains valid, but also the object pointed to. Valgrind trace: Invalid read of size 8 Gtkmm2ext::Pane::forall_vfunc(int, void (*)(_GtkWidget*, void*), void*) (pane.cc:617) Gtk::Container_Class::forall_vfunc_callback(_GtkContainer*, int, void (*)(_GtkWidget*, void*), void*) gtk_container_destroy (gtkcontainer.c:1073) g_closure_invoke (gclosure.c:804) ... g_object_run_dispose (gobject.c:1084)
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