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virtual void stopping(std::shared_ptr<Session> const& session) = 0;
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virtual void focused(std::shared_ptr<Session> const& session) = 0;
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virtual void unfocused() = 0;
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virtual void surface_created(Session& session, std::shared_ptr<Surface> const& surface) = 0;
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virtual void destroying_surface(Session& session, std::shared_ptr<Surface> const& surface) = 0;