WIP: Added support for top and bottom layers for MMU segmentation.

src/libslic3r/Print.hpp

@@ -242,6 +242,9 @@ public:
 
     // Returns MMU segmentation based on painting in MMU segmentation gizmo
     std::vector<std::vector<std::pair<ExPolygon, size_t>>> mmu_segmentation_by_painting();
+    // Returns MMU segmentation of top and bottom layers based on painting in MMU segmentation gizmo
+    std::vector<std::vector<ExPolygons>> mmu_segmentation_top_and_bottom_layers();
+
 private:
     // to be called from Print only.
     friend class Print;