Constification: make Stateful::get_state() const, with all other required const-ness added (libs)
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@@ -133,7 +133,7 @@ public:
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virtual void* get_gui () const { return 0; }
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virtual void tear_down_gui () {}
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XMLNode& get_state ();
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XMLNode& get_state () const;
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int set_state (XMLNode const&, int version);
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static const std::string state_node_name;
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