Need to disable and enable Collider after mesh.Refresh() ?

I'm trying the MeshEditorScene under "Assets/Samples/ProBuilder/4.4.0/Runtime Examples/Runtime Editing".

1. I extrude the top face of the cube to make it higher.
2. When I hover mouse over the top face, it is no longer highlighted. And I cannot extrude this top face again.
   
   
   
3. It looks like this is caused by collider not being updated after the mesh has changed.
4. So I added code in MeshEditor.cs (Line 20 to 23) to "refresh" the collider. After this change, when I hover the mouse over the top face, it is highlighted and can be extruded again.

Code (CSharp):

1.  
2.         void UpdateDrag()
3.         {
4.             var distance = GetDragDistance() - m_DragState.offset;
5.  
6.             var mesh = m_Selection.mesh;
7.             var indices = m_DragState.meshState.indices;
8.             var vertices = m_DragState.meshState.vertices;
9.             var origins = m_DragState.meshState.origins;
10.             // Constraint is in world coordinates, but we need model space when applying changes to mesh values.
11.             var direction = mesh.transform.InverseTransformDirection(m_DragState.constraint.direction);
12.  
13.             for (int i = 0, c = indices.Count; i < c; i++)
14.                 vertices[indices[i]] = origins[i] + direction * distance;
15.  
16.             mesh.positions = vertices;
17.             mesh.ToMesh();
18.             mesh.Refresh();
19.  
20.             //======= "Refresh" collider =======
21.             var col = mesh.GetComponent<Collider>();
22.             col.enabled = false;
23.             col.enabled = true;
24.         }
25.  

Question:
Is this how it's supposed to behave? Do I really need to disable and enable the collider to make it work?



Environment:
* Unity 2019.4.13f1
* ProBuilder 4.4.0

 

Anyone knows the answer ? Is this a bug or I'm missing something?

 

Thanks for the tips! I tried SelectionPicker.PickFacesInRect() and it could give me the object that was under cursor without using collider.