Resolved EditorWindow "Failed to load" after entering and exiting play mode

I just spent the better part of the hour trying to find out why my editor window wouldn't load after entering and exiting play mode.

Basically before play mode:


After exiting play mode:



Long story short: The class name and the filename must match. In my case I had just a typo during refactoring.

Repro case:

create file

Code (csharp):

1. MyBrokenEditorWindow.cs

with content

Code (CSharp):

1. using UnityEditor;
2. using UnityEngine;
3.  
4. public class TestMyBrokenEditorWindow : EditorWindow
5. {
6.     [MenuItem("Window/Test/MyBrokenEditorWindow")]
7.     public static void CreateWindow()
8.     {
9.         TestMyBrokenEditorWindow wnd = GetWindow<TestMyBrokenEditorWindow>();
10.         wnd.titleContent = new GUIContent("TestMyBrokenEditorWindow");
11.     }
12.  
13. }

Open the window via menu, dock it anywhere. Enter and exit play mode with Maximized window setting and the problem will occur.

I searched here on the forum, but didn't find a solution. I thought I'd share before anyone else wastes their time with the same problem.

Unity version I have this is 2021.3.27. Seems to be solved somewhere between this and 2023.0.2.b7 which is the other version I tested in order to file a bug report.

 

Doesn't seem like a bug to me. EditorWindow inherits from ScriptableObject, and ScriptableObject class names must match the name of the script file they're defined in, just like for MonoBehaviour.

 

It's a bug. It was fixed