Define CellularPanel::Root

src/AdornedRulerPanel.h

@@ -172,6 +172,11 @@ private:
    //
    // CellularPanel implementation
    //
+
+   // Get the root object defining a recursive subdivision of the panel's
+   // area into cells
+   std::shared_ptr<TrackPanelNode> Root() override;
+
    FoundCell FindCell(int mouseX, int mouseY) override;
    wxRect FindRect(const TrackPanelCell &cell) override;
 public: