fix: Fixed MissingMethodException when using Unity 2021

Author: SolidAlloy

GenericUnityEditorInternals.dll

@@ -39,13 +39,13 @@
         <Reference Include="System.Core" />
         <Reference Include="System.Xml" />
         <Reference Include="UnityEngine.CoreModule">
-            <HintPath>C:\Program Files\Unity Editors\2020.2.4f1\Editor\Data\Managed\UnityEngine\UnityEngine.CoreModule.dll</HintPath>
+            <HintPath>C:\Program Files\Unity Editors\2021.1.3f1\Editor\Data\Managed\UnityEngine\UnityEngine.CoreModule.dll</HintPath>
         </Reference>
         <Reference Include="UnityEditor.CoreModule">
-            <HintPath>c:\Program Files\Unity Editors\2020.2.4f1\Editor\Data\Managed\UnityEngine\UnityEditor.CoreModule.dll</HintPath>
+            <HintPath>c:\Program Files\Unity Editors\2021.1.3f1\Editor\Data\Managed\UnityEngine\UnityEditor.CoreModule.dll</HintPath>
         </Reference>
         <Reference Include="UnityEngine.IMGUIModule">
-            <HintPath>c:\Program Files\Unity Editors\2020.2.4f1\Editor\Data\Managed\UnityEngine\UnityEngine.IMGUIModule.dll</HintPath>
+            <HintPath>c:\Program Files\Unity Editors\2021.1.3f1\Editor\Data\Managed\UnityEngine\UnityEngine.IMGUIModule.dll</HintPath>
         </Reference>
         <Reference Include="GenericUnityObjects">
             <HintPath>..\..\..\..\Library\ScriptAssemblies\GenericUnityObjects.dll</HintPath>

GenericUnityInternals~/GenericUnityEditorInternals/GenericUnityEditorInternals.csproj

@@ -14,7 +14,7 @@ internal readonly struct ObjectFieldHelper
     {
         public readonly Type ObjType;
         public readonly Object CurrentTarget;
-        
+
         private static readonly GUIContent _cachedContent = new GUIContent();
 
         private readonly SerializedProperty _property;
@@ -52,7 +52,7 @@ public GUIContent GetObjectFieldContent(Object obj, string niceTypeName)
                 return EditorGUIUtility.TempContent($"None ({niceTypeName})");
 
             _cachedContent.text = $"{obj.name} ({niceTypeName})";
-            _cachedContent.image = EditorGUIUtility.GetSkinnedIcon(AssetPreview.GetMiniThumbnail(obj));
+            _cachedContent.image = AssetPreview.GetMiniThumbnail(obj);
 
             if (_property == null)
                 return _cachedContent;

GenericUnityInternals~/GenericUnityEditorInternals/ObjectFieldHelper.cs

@@ -67,7 +67,7 @@ public static void ShowGeneric(this ObjectSelector this_, Object obj, Object obj
             this_.m_ModalUndoGroup = Undo.GetCurrentGroup();
 
             // Show custom selector if available
-            if (UnityEditor.SearchService.ObjectSelector.HasEngineOverride())
+            if (ObjectSelectorSearch.HasEngineOverride())
             {
                 this_.m_SearchSessionHandler.BeginSession(() =>
                 {
@@ -117,7 +117,7 @@ void OnSelectorClosed(Object selectedObj, bool canceled)
                     this_.NotifySelectorClosed(false);
                 }
 
-                if (UnityEditor.SearchService.ObjectSelector.SelectObject(searchContext, OnSelectorClosed, OnSelectionChanged))
+                if (ObjectSelectorSearch.SelectObject(searchContext, OnSelectorClosed, OnSelectionChanged))
                     return;
             }