Add ControlChildSize option to disable autosizing child controls in UI panel

#2511

Source/Engine/UI/GUI/Panels/PanelWithMargins.cs

@@ -1,5 +1,7 @@
 // Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
 
+using System.ComponentModel;
+
 namespace FlaxEngine.GUI
 {
     /// <summary>
@@ -133,7 +135,7 @@ namespace FlaxEngine.GUI
         /// <summary>
         /// Gets or sets the value indicating whenever the panel size will be based on a children dimensions.
         /// </summary>
-        [EditorOrder(30), Tooltip("If checked, the panel size will be based on a children dimensions.")]
+        [EditorOrder(30), DefaultValue(true), Tooltip("If checked, the panel size will be based on a children dimensions.")]
         public bool AutoSize
         {
             get => _autoSize;
@@ -147,6 +149,12 @@ namespace FlaxEngine.GUI
             }
         }
 
+        /// <summary>
+        /// Gets or sets the value indicating whenever the panel can resize children controls (eg. auto-fit width/height).
+        /// </summary>
+        [EditorOrder(35), DefaultValue(true), Tooltip("If checked, the panel can resize children controls (eg. auto-fit width/height).")]
+        public bool ControlChildSize { get; set; } = true;
+
         /// <summary>
         /// Gets or sets the panel area margin.
         /// </summary>