Editor variable changes saved properly

Before changing a variable would not be detected and so not saved/serialized in some cases.

Author: rogerbarton

scripts/Editor/DllManipulatorEditor.cs

@@ -8,6 +8,8 @@
 #endif
 using System.IO;
 using System;
+using UnityEditor.SceneManagement;
+using UnityEngine.SceneManagement;
 
 namespace UnityNativeTool.Internal
 {
@@ -139,6 +141,12 @@ public override void OnInspectorGUI()
                 var time = t.InitializationTime.Value;
                 EditorGUILayout.LabelField($"Initialized in: {(int)time.TotalSeconds}.{time.Milliseconds.ToString("D3")}s");
             }
+
+            if (GUI.changed)
+            {
+                EditorUtility.SetDirty(target);
+                EditorSceneManager.MarkSceneDirty(SceneManager.GetActiveScene());
+            }
         }
 
         private void DrawUsedDlls(IList<NativeDllInfo> usedDlls)