cbf5f3d622
Gtkmm2Ext::Pane::on_add() uses a pointer to a std::vector<> element in the destroy notify callback. If the vector is modified, that pointer becomes invalid. Add 2 widgets "A", "B". remove "B", add another one "C". Now if A is destroyed, notify_child_destroyed(PTR) points to invalid memory and not to "A".
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