Add .clone() to prevent crash with SourceModels[0]

docs/Slate_API.md

@@ -824,6 +824,31 @@ Check this example: https://github.com/20tab/UnrealEnginePython/blob/master/exam
 
 It shows even how to register new style sets.
 
+## SPythonComboBox
+
+```python
+from unreal_engine import SWindow, STextBlock, SPythonComboBox
+
+def generate_combo_box_widget(item):
+  return STextBlock(text=item)
+
+def get_current_item():
+  return combo_box.get_selected_item()
+
+def on_selection_changed(item, index):
+  print ('New selection: %s, %s' % (item, index))
+
+items = ['spam', 'ham', 'eggs']
+combo_box = SPythonComboBox(options_source=items, on_generate_widget=generate_combo_box_widget, content=STextBlock(text=get_current_item), on_selection_changed=on_selection_changed)
+combo_box.set_selected_item(items[0])
+
+SWindow(client_size=(300,30))(
+    combo_box
+)
+```
+
+![SDetailView](screenshots/slate_SPythonComboBox.png)
+
 ## SPythonListView
 
 ## SPythonTreeView

tutorials/SnippetsForStaticAndSkeletalMeshes.md

@@ -97,7 +97,7 @@ def fix_pivot(static_mesh):
     raw_mesh.set_vertex_positions(updated_positions)
 
     # assign the mesh data to the first LOD (LODs are exposed in SourceModels array)
-    raw_mesh.save_to_static_mesh_source_model(new_static_mesh.SourceModels[0])
+    raw_mesh.save_to_static_mesh_source_model(new_static_mesh.SourceModels[0].clone())
     # rebuild the whole mesh
     new_static_mesh.static_mesh_build()
     # re-do the body setup (collisions and friends)
@@ -171,7 +171,7 @@ def add_lods(static_mesh):
     raw_mesh.save_to_static_mesh_source_model(lod2)
 
     # assign the new LODs (leaving the first one untouched)
-    new_static_mesh.SourceModels = [new_static_mesh.SourceModels[0], lod1, lod2]
+    new_static_mesh.SourceModels = [new_static_mesh.SourceModels[0].clone(), lod1, lod2]
     # rebuild the whole mesh
     new_static_mesh.static_mesh_build()
     # re-do the body setup (collisions and friends)