test

My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/Utilities/Editor/NoFoldOutPropertyDrawer.cs

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+using UnityEditor;
+using UnityEngine;
+
+namespace Timeline.Samples
+{
+    // Custom property drawer that draws all child properties inline
+    [CustomPropertyDrawer(typeof(NoFoldOutAttribute))]
+    public class NoFoldOutPropertyDrawer : PropertyDrawer
+    {
+        public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+        {
+            if (!property.hasChildren)
+                return base.GetPropertyHeight(property, label);
+            property.isExpanded = true;
+            return EditorGUI.GetPropertyHeight(property, label, true) -
+                EditorGUI.GetPropertyHeight(property, label, false);
+        }
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            if (!property.hasChildren)
+                EditorGUI.PropertyField(position, property, label);
+            else
+            {
+                SerializedProperty iter = property.Copy();
+                var nextSibling = property.Copy();
+                nextSibling.Next(false);
+                property.Next(true);
+                do
+                {
+                    // We need to check against nextSibling to properly stop
+                    // otherwise we will draw properties that are not child of this
+                    // foldout.
+                    if (SerializedProperty.EqualContents(property, nextSibling))
+                        break;
+                    float height = EditorGUI.GetPropertyHeight(property, property.hasVisibleChildren);
+                    position.height = height;
+                    EditorGUI.PropertyField(position, property, property.hasVisibleChildren);
+                    position.y = position.y + height;
+                }
+                while (property.NextVisible(false));
+            }
+        }
+    }
+}

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My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/Utilities/Editor/Timeline.Samples.Utilities.Editor.asmdef

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+{
+    "name": "Timeline.Samples.Utilities.Editor",
+    "references": [
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+    ],
+    "includePlatforms": [
+        "Editor"
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+    "noEngineReferences": false
+}

My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/Utilities/Editor/Timeline.Samples.Utilities.Editor.asmdef.meta

@@ -0,0 +1,7 @@
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