How to prevent Unity Editor Scene default selection behavior

EditorSelection.cs

using UnityEngine;
using UnityEditor;

namespace ConditionalEditorSelection
{
    // 2021.1.1
    // Written by Sami S.
    // How to prevent Unity Editor Scene default selection behavior
    
    // NOTE:
    // Open EditorSelection from menu "Window"
    // Enter a filter matching scene object name
    // Click any object, only objects matching filter get selected
    // Clicking empty areas will deselect current selection


    public class EditorSelection : EditorWindow
    {
        GameObject selection;
        GameObject previousSelection;

        string nameFilter = "filter here";

        [MenuItem("Window/ConditionalSelection")]
        static void Init()
        {
            EditorSelection window = (EditorSelection)EditorWindow.GetWindow(typeof(EditorSelection));
            window.Show();
        }


        void OnEnable()
        {
            SceneView.onSceneGUIDelegate -= this.OnSceneGUI;
            SceneView.onSceneGUIDelegate += this.OnSceneGUI;
        }

        void OnGUI()
        {
            GUILayout.Label("Selection filter:", EditorStyles.boldLabel);
            nameFilter = EditorGUILayout.TextField(nameFilter);
        }


        void OnSelectionChange()
        {
            Debug.Log("OnSelectionChange");
        }


        void OnSceneGUI(SceneView sceneView)
        {
            // Skip layouting

            HandleUtility.AddDefaultControl(GUIUtility.GetControlID(FocusType.Passive));

            if (Event.current.type == EventType.Layout)
            {
                return;
            }

            if (Event.current.type == EventType.MouseMove)
            {
                var go = HandleUtility.PickGameObject(Event.current.mousePosition, false);
                selection = go;
            }

            if (Event.current.type == EventType.MouseDown)
            {
                // Debug.Log("id: " + GUIUtility.hotControl);

                if (selection != null)
                {
                    previousSelection = selection;
                    Debug.Log("selection:" + selection.name);
                }
            }


            // conditional selection
            if (Event.current.type == EventType.MouseUp)
            {
                if (selection != null && selection.name.ToLower().Contains(nameFilter))
                {
                    Selection.objects = new GameObject[1] { selection };
                }

                if (selection == null)
                {
                    Selection.objects = new GameObject[0];
                }
            }

        }
    }
}