選択されたComponentと同一のComponentを持つ子GameObjectを選択するやつ

GameObjectSelector.cs

/*
 * © @a1678991
 */
using System.Linq;
using UnityEditor;
using UnityEngine;

public class GameObjectSelector : MonoBehaviour
{
    private static void SelectGameObjectsInChildren(GameObject root, Component selectedComponent)
    {
        var childComponents = root.GetComponentsInChildren(selectedComponent.GetType(), true);
        var gameObjects = childComponents.Select(c => c.gameObject.GetInstanceID()).ToArray();
        Selection.instanceIDs = gameObjects;
    }

    [MenuItem("CONTEXT/Component/Select GameObject with this component in children")]
    private static void SelectGameObjectsInChildren(MenuCommand menuCommand)
    {
        var selectedComponent = menuCommand.context as Component;
        if (selectedComponent == null)
        {
            Debug.LogError("Selected component is null");
            return;
        }
        var selectedRoot = selectedComponent.gameObject;
        if (selectedRoot == null)
        {
            Debug.LogError("Selected component's gameObject is null");
            return;
        }
        SelectGameObjectsInChildren(selectedRoot, selectedComponent);
    }
}