Geometry Nodes: Copy spline attributes in the curve resample node

Previously only point domain attributes were copied to the result curve.

source/blender/blenkernel/BKE_attribute_access.hh

@@ -329,6 +329,7 @@ class CustomDataAttributes {
   ~CustomDataAttributes();
   CustomDataAttributes(const CustomDataAttributes &other);
   CustomDataAttributes(CustomDataAttributes &&other);
+  CustomDataAttributes &operator=(const CustomDataAttributes &other);
 
   void reallocate(const int size);
 

source/blender/blenkernel/intern/attribute_access.cc

@@ -617,6 +617,16 @@ CustomDataAttributes::CustomDataAttributes(CustomDataAttributes &&other)
   CustomData_reset(&other.data);
 }
 
+CustomDataAttributes &CustomDataAttributes::operator=(const CustomDataAttributes &other)
+{
+  if (this != &other) {
+    CustomData_copy(&other.data, &data, CD_MASK_ALL, CD_DUPLICATE, other.size_);
+    size_ = other.size_;
+  }
+
+  return *this;
+}
+
 std::optional<GSpan> CustomDataAttributes::get_for_read(const StringRef name) const
 {
   BLI_assert(size_ != 0);

source/blender/nodes/geometry/nodes/node_geo_curve_resample.cc

@@ -153,7 +153,7 @@ static std::unique_ptr<CurveEval> resample_curve(const CurveEval &input_curve,
     }
   }
 
-  output_curve->attributes.reallocate(output_curve->splines().size());
+  output_curve->attributes = input_curve.attributes;
 
   return output_curve;
 }