Merge branch 'master' of https://github.com/Prusa3d/Slic3r

src/libslic3r/Model.cpp

@@ -699,6 +699,14 @@ void ModelObject::clear_volumes()
     this->invalidate_bounding_box();
 }
 
+void ModelObject::reset_volumes_idxs()
+{
+    for (ModelVolume *v : this->volumes)
+    {
+        v->set_new_unique_id();
+    }
+}
+
 ModelInstance* ModelObject::add_instance()
 {
     ModelInstance* i = new ModelInstance(this);