Keep multiple custom handles visible in the Scene view

Hi, I have created a custom Editor to create a path system with waypoint with custom Handles which works fine.

My problem is that my custom handles are hidden when I am not selecting my gameobject which is a normal behavior but I didn't managed to make it work properly in my case.

This is what I tried to do :

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEditor;
 
 [CustomEditor(typeof(PathCreator))]
 public class PathEditor : Editor
 {
     public override void OnInspectorGUI()
     {
         // Show some button in my Inspector window
     }
 
     private void OnSceneGUI(SceneView sv)
     {
         Input();
         Draw();
     }
 
     void Input()
     {
         // Adding or removing some waypoint
     }
 
     void Draw()
     {
         // Add the custom handles
     }
 
     private void OnEnable()
     {
         SceneView.duringSceneGui += OnSceneGUI;
 
        // Some code to create my path
     }
 
     private void OnDisable()
     {
         SceneView.duringSceneGui -= OnSceneGUI;
     }
 
     private void OnDestroy()
     {
         SceneView.duringSceneGui -= OnSceneGUI;
     }
 }

The two method OnDisable and OnDestroy are being called every time I am unselecting my game object while I thought only OnDisable would've been called.

If I do not add the SceneView.duringSceneGui -= OnSceneGUI; in those two method above, the handles stays and it's kinda fine but I have a couple of issue :

• The first one is that I have a "Reset" button in my custom Editor that reset the position of the path like so :

     public override void OnInspectorGUI()
       {
           base.OnInspectorGUI();
           if (GUILayout.Button("Reset"))
           {
               creator.CreatePath();
               path = creator.path;
               checkpoints = creator.checkpoints;
               for (int i = 0; i < path.NumPoints; i++)
               {
                   checkpoints.AddCheckpoint(Vector3.zero);
               }
               selectedPoint = -1;
               SceneView.RepaintAll();
           }
       }
  
  

I don't think you need to get all the code here but I do a SceneView.RepaintAll(); once my path is being reset and this works when I am not using SceneView.duringSceneGui -= OnSceneGUI;, it doesn't remove the older path and add a new (the reset) one. What should I do in that case ?

• The second issue is that, I will need to show multiple path at the same time in my Scene window. How does that works with adding OnSceneGUI to SceneView.duringSceneGui ?

Thanks for the help