Merge remote-tracking branch 'origin/master' into 1.9

Source/Editor/Content/Import/TextureImportEntry.cs

@@ -58,10 +58,10 @@ namespace FlaxEngine.Tools
                     FieldInfo[] fields = typeof(CustomMaxSizes).GetFields();
                     for (int i = 0; i < fields.Length; i++)
                     {
-                        var field = fields[i];
-                        if (field.Name.Equals("value__"))
+                        var @field = fields[i];
+                        if (@field.Name.Equals("value__"))
                             continue;
-                        if (value == (int)field.GetRawConstantValue())
+                        if (value == (int)@field.GetRawConstantValue())
                             return (CustomMaxSizes)value;
                     }
                     return CustomMaxSizes._8192;

Source/Editor/Content/Items/VisualScriptItem.cs

@@ -100,12 +100,16 @@ namespace FlaxEditor.Content
         /// <inheritdoc />
         public object GetValue(object obj)
         {
+            if (!_type.Asset)
+                throw new TargetException("Missing Visual Script asset.");
             return _type.Asset.GetScriptInstanceParameterValue(_parameter.Name, (Object)obj);
         }
 
         /// <inheritdoc />
         public void SetValue(object obj, object value)
         {
+            if (!_type.Asset)
+                throw new TargetException("Missing Visual Script asset.");
             _type.Asset.SetScriptInstanceParameterValue(_parameter.Name, (Object)obj, value);
         }
     }

Source/Editor/Content/Proxy/JsonAssetProxy.cs

@@ -166,6 +166,25 @@ namespace FlaxEditor.Content
         /// <inheritdoc />
         public override string Name { get; } = Utilities.Utils.GetPropertyNameUI(typeof(T).Name);
 
+        private SpriteHandle _thumbnail;
+
+        /// <summary>
+        /// Default Constructor.
+        /// </summary>
+        public SpawnableJsonAssetProxy()
+        {
+            _thumbnail = SpriteHandle.Invalid;
+        }
+        
+        /// <summary>
+        /// Constructor with overriden thumbnail.
+        /// </summary>
+        /// <param name="thumbnail">The thumbnail to use.</param>
+        public SpawnableJsonAssetProxy(SpriteHandle thumbnail)
+        {
+            _thumbnail = thumbnail;
+        }
+
         /// <inheritdoc />
         public override bool CanCreate(ContentFolder targetLocation)
         {
@@ -177,6 +196,12 @@ namespace FlaxEditor.Content
         {
             Editor.SaveJsonAsset(outputPath, new T());
         }
+        
+        /// <inheritdoc />
+        public override AssetItem ConstructItem(string path, string typeName, ref Guid id)
+        {
+            return _thumbnail.IsValid ? new JsonAssetItem(path, id, typeName, _thumbnail) : base.ConstructItem(path, typeName, ref id);
+        }
 
         /// <inheritdoc />
         public override string TypeName { get; } = typeof(T).FullName;

Source/Editor/Content/Proxy/PrefabProxy.cs

@@ -73,6 +73,16 @@ namespace FlaxEditor.Content
             return targetLocation.CanHaveAssets;
         }
 
+        /// <inheritdoc />
+        public override bool CanReimport(ContentItem item)
+        {
+            if (item is not PrefabItem prefabItem)
+                return base.CanReimport(item);
+
+            var prefab = FlaxEngine.Content.Load<Prefab>(prefabItem.ID);
+            return prefab.GetDefaultInstance().GetScript<ModelPrefab>() != null;
+        }
+
         /// <inheritdoc />
         public override void Create(string outputPath, object arg)
         {