Method reassign_context

ThirdParty/libproj/vtklibproj/src/grids.cpp:2531–2533

                    std::unique_ptr<GTiffGenericGrid> &&subgrid);

    void reassign_context(PJ_CONTEXT *ctx) override {
        m_grid->reassign_context(ctx);
    }

    bool hasChanged() const override { return m_grid->hasChanged(); }
};