EditorPlaymodeStop.cs

using UnityEditor;
using UnityEngine;


[InitializeOnLoad]
public class EditorEvents
{
    // InitializeOnLoad causes this to get called when the editor starts up
    static EditorEvents()
    {
        EditorApplication.update += Update;
    }

    static void Update()
    {
        // If compiling starts while in play mode, it's often really useful to just quit now before the errors start spinning up!
        if (EditorApplication.isPlaying && EditorApplication.isCompiling && EditorPrefs.GetBool(EditorPlaymodeStop.CompileStopsPlayPrefsKey, true))
            EditorApplication.isPlaying = false;
    }
}

public class EditorPlaymodeStop : EditorWindow
{
    public const string CompileStopsPlayPrefsKey = "CompilingStopsPlay";

    [MenuItem("Window/Playmode Stop Options")]
    static void Init()
    {
        // Get existing open window or if none, make a new one:        
        var window = EditorWindow.GetWindow<EditorPlaymodeStop>();
        window.titleContent = new GUIContent("Preferences");
        window.Show();
    }

    void OnGUI()
    {
        GUILayout.Label("Should the editor stop play-mode automatically if it detects that the application is recompiling while playing?", EditorStyles.wordWrappedLabel);
        bool shouldStop = EditorPrefs.GetBool(CompileStopsPlayPrefsKey, true);
        bool shouldStopPrev = shouldStop;

        shouldStop = EditorGUILayout.Toggle("Stop Play Automatically", shouldStop);
        if (shouldStop != shouldStopPrev)
        {
            EditorPrefs.SetBool(CompileStopsPlayPrefsKey, shouldStop);
        }
    }
}