Fix heap-use-after-free for IPCProxyBinderBase#324
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Co-authored-by: Radoslaw Buczkowski <rbuczkowski@luxoft.com>
Listener context object was already deleted, but not yet removed from registry at the point of notifyListeners call, which causes undefined behavior. Applications does not have to crash because the memory is still accessible, but they may crash at some point. Added temporary protection mechanism. Co-authored-by: Radoslaw Buczkowski <rbuczkowski@luxoft.com>
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