Ensure correct recursive copy of the mirror node

src/editor/nodes/MirrorNode.js

@@ -18,13 +18,13 @@ export default class MirrorNode extends EditorNodeMixin(Mirror) {
 
   constructor(editor) {
     super(editor);
+
+    this.color = "#7f7f7f";
   }
 
   copy(source, recursive = true) {
     super.copy(source, recursive);
 
-    this.color = source.color;
-
     return this;
   }
 

src/editor/objects/Mirror.js

@@ -17,8 +17,22 @@ export default class Mirror extends Object3D {
     this.mesh.material.uniforms.color.value = new Color(value);
   }
 
-  copy(source) {
-    super.copy(source, false);
+  copy(source, recursive = true) {
+    if (recursive) {
+      this.remove(this.mesh);
+    }
+
+    super.copy(source, recursive);
+
+    if (recursive) {
+      const _meshIndex = source.children.indexOf(source.mesh);
+
+      if (_meshIndex !== -1) {
+        this.mesh = this.children[_meshIndex];
+      }
+    }
+
+    this.color = source.color;
 
     return this;
   }