various fixes and improvements. size changes for headers, deactivate containement for collections.

Source/Editor/CustomEditors/Dedicated/ActorEditor.cs

@@ -94,7 +94,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 {
                     if (actor != null)
                         group.Panel.TooltipText = Surface.SurfaceUtils.GetVisualScriptTypeDescription(TypeUtils.GetObjectType(actor));
-                    const float settingsButtonSize = 14;
+                    const float settingsButtonSize = 20;
                     var settingsButton = new Image
                     {
                         TooltipText = "Settings",

Source/Editor/CustomEditors/Dedicated/ScriptsEditor.cs

@@ -641,16 +641,16 @@ namespace FlaxEditor.CustomEditors.Dedicated
                     IsScrollable = false,
                     Checked = script.Enabled,
                     Parent = group.Panel,
-                    Size = new Float2(14, 14),
+                    Size = new Float2(20, 20),
-                    Bounds = new Rectangle(16, 0, 14, 14),
+                    Bounds = new Rectangle(20, 0, 20, 20),
-                    BoxSize = 12.0f,
+                    BoxSize = 16.0f,
                     Tag = script,
                 };
                 scriptToggle.StateChanged += OnScriptToggleCheckChanged;
                 _scriptToggles[i] = scriptToggle;
 
                 // Add drag button to the group
-                const float dragIconSize = 14;
+                const float dragIconSize = 20;
                 var scriptDrag = new ScriptDragIcon(this, script)
                 {
                     TooltipText = "Script reference",
@@ -665,7 +665,7 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 };
 
                 // Add settings button to the group
-                const float settingsButtonSize = 14;
+                const float settingsButtonSize = 20;
                 var settingsButton = new Image
                 {
                     TooltipText = "Settings",

Source/Editor/CustomEditors/Elements/Container/GroupElement.cs

@@ -18,6 +18,9 @@ namespace FlaxEditor.CustomEditors.Elements
             ArrowImageClosed = new SpriteBrush(Style.Current.ArrowRight),
             ArrowImageOpened = new SpriteBrush(Style.Current.ArrowDown),
             EnableDropDownIcon = true,
+            ItemsMargin = new Margin(7, 7, 3, 3),
+            HeaderHeight = 20,
+            EnableContainmentLines = true,
         };
 
         /// <inheritdoc />

Source/Editor/CustomEditors/LayoutElementsContainer.cs

@@ -96,6 +96,7 @@ namespace FlaxEditor.CustomEditors
             if (useTransparentHeader)
             {
                 element.Panel.EnableDropDownIcon = true;
+                element.Panel.EnableContainmentLines = false;
                 element.Panel.HeaderColor = element.Panel.HeaderColorMouseOver = Color.Transparent;
             }
             OnAddElement(element);

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

@@ -131,6 +131,12 @@ namespace FlaxEngine.GUI
         [EditorDisplay("Style"), EditorOrder(2000)]
         public bool EnableDropDownIcon { get; set; }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether to enable containment line drawing,
+        /// </summary>
+        [EditorDisplay("Style"), EditorOrder(2000)]
+        public bool EnableContainmentLines { get; set; } = false;
+
         /// <summary>
         /// Occurs when mouse right-clicks over the header.
         /// </summary>
@@ -370,6 +376,16 @@ namespace FlaxEngine.GUI
 
             Render2D.DrawText(HeaderTextFont.GetFont(), HeaderTextMaterial, HeaderText, textRect, textColor, TextAlignment.Near, TextAlignment.Center);
 
+            
+            if (!_isClosed && EnableContainmentLines)
+            {
+                Color lineColor = Style.Current.ForegroundGrey - new Color(0, 0, 0, 100);
+                float lineThickness = 0.05f;
+                Render2D.DrawLine(new Float2(1, HeaderHeight), new Float2(1, Height), lineColor, lineThickness);
+                Render2D.DrawLine(new Float2(1, Height), new Float2(Width, Height), lineColor, lineThickness);
+                Render2D.DrawLine(new Float2(Width, HeaderHeight), new Float2(Width, Height), lineColor, lineThickness);
+            }
+            
             // Children
             DrawChildren();
         }