Set geometry when transforming curve

crates/fj-core/src/operations/transform/curve.rs

@@ -18,7 +18,27 @@ impl TransformObject for Handle<Curve> {
         // must be created to represent the new and transformed curve.
         cache
             .entry(self)
-            .or_insert_with(|| Curve::new().insert(core))
+            .or_insert_with(|| {
+                // We don't actually need to transform the curve, as its
+                // geometry is locally defined on a surface. We need to set that
+                // geometry for the new object though, that we created here to
+                // represent the transformed curve.
+
+                let curve = Curve::new().insert(core);
+
+                let curve_geom = core.layers.geometry.of_curve(self).cloned();
+                if let Some(curve_geom) = curve_geom {
+                    for (surface, local_definition) in curve_geom.definitions {
+                        core.layers.geometry.define_curve(
+                            curve.clone(),
+                            surface,
+                            local_definition,
+                        );
+                    }
+                }
+
+                curve
+            })
             .clone()
     }
 }