A trial to move component without clone. This does not work.

MoveComponentTest.cs

/*
 * Move Component Test
 * https://gist.github.com/anatawa12/b8799da5d3131e4020f414439a4ea037
 *
 * A trial to move component without clone. This does not work well
 *
 * MIT License
 * 
 * Copyright (c) 2023 anatawa12
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;

namespace anatawa12.gists
{
    public class MoveComponentTest : EditorWindow
    {
        public Component component;
        public GameObject target;

        private SerializedObject _serialized;
        private SerializedProperty _component;
        private SerializedProperty _target;

        [MenuItem("Tools/anatawa12 gists/Move Compoent Test")]
        private static void Open() => CreateWindow<MoveComponentTest>();

        private void OnEnable()
        {
            _serialized = new SerializedObject(this);
            _component = _serialized.FindProperty(nameof(component));
            _target = _serialized.FindProperty(nameof(target));
        }

        private void OnGUI()
        {
            _serialized.Update();
            EditorGUILayout.ObjectField(_component);
            EditorGUILayout.ObjectField(_target);
            _serialized.ApplyModifiedProperties();

            using (new EditorGUI.DisabledScope(!component || !target || component.gameObject == target))
            {
                if (GUILayout.Button("Move Component"))
                {
                    var componentSerialized = new SerializedObject(component);
                    var oldGameObjectSerialized = new SerializedObject(component.gameObject);
                    var newGameObjectSerialized = new SerializedObject(target);
                    var gameObjectProp = componentSerialized.FindProperty("m_GameObject");
                    var oldComponentsProp = oldGameObjectSerialized.FindProperty("m_Component");
                    for (var i = 0; i < oldComponentsProp.arraySize; i++)
                    {
                        if (oldComponentsProp.GetArrayElementAtIndex(i).FindPropertyRelative("component")
                                .objectReferenceValue == component)
                        {
                            oldComponentsProp.DeleteArrayElementAtIndex(i);
                            break;
                        }
                    }

                    var newComponentsProp = newGameObjectSerialized.FindProperty("m_Component");
                    newComponentsProp.arraySize += 1;
                    newComponentsProp.GetArrayElementAtIndex(newComponentsProp.arraySize - 1)
                        .FindPropertyRelative("component").objectReferenceValue = component;
                    gameObjectProp.objectReferenceValue = target;

                    oldGameObjectSerialized.ApplyModifiedProperties();
                    componentSerialized.ApplyModifiedProperties();
                    newGameObjectSerialized.ApplyModifiedProperties();
                }
            }
        }
    }
}
#endif