Fix for issue #2765, arrange crash with custom beds

src/libslic3r/Arrange.cpp

@@ -492,8 +492,11 @@ BedShapeHint::BedShapeHint(const Polyline &bed) {
         m_type = BedShapes::bsCircle;
         m_bed.circ = c;
     } else {
+        if (m_type == BedShapes::bsIrregular)
+             m_bed.polygon.Slic3r::Polyline::~Polyline();
+
         m_type = BedShapes::bsIrregular;
-        m_bed.polygon = bed;
+        ::new (&m_bed.polygon) Polyline(bed);
     }
 }
 

src/libslic3r/Arrange.hpp

@@ -45,12 +45,12 @@ class BedShapeHint {
         Polyline    polygon;
         InfiniteBed infbed{};
         ~BedShape_u() {}
-        BedShape_u() {};
+        BedShape_u() {}
     } m_bed;
     
 public:
 
-    BedShapeHint(){};
+    BedShapeHint(){}
     
     /// Get a bed shape hint for arrange() from a naked Polyline.
     explicit BedShapeHint(const Polyline &polyl);
@@ -73,7 +73,7 @@ public:
     {
         if (m_type == BedShapes::bsIrregular)
             m_bed.polygon.Slic3r::Polyline::~Polyline();
-    };
+    }
 
     BedShapeHint(const BedShapeHint &cpy) { *this = cpy; }
     BedShapeHint(BedShapeHint &&cpy) { *this = std::move(cpy); }