Move layouting to Render instead of Update, use Update for input.

TODO.md

@@ -78,7 +78,7 @@
     - ~~GridContainer~~
     - ~~FlexContainer~~
   - ~~Positioning (anchors)~~
-- Move layouting to Render instead of Update, use Update for input.
+- ~~Move layouting to Render instead of Update, use Update for input.~~
 - Input propagation
 - Basic input elements (button, text field, toggle).
 - Styling.

Voile/Source/UI/UISystem.cs

@@ -35,16 +35,17 @@ public class UISystem : IUpdatableSystem, IRenderableSystem
     public void Update(double deltaTime)
     {
         HandleInput();
+    }
 
+    public void Render(RenderSystem renderer)
+    {
+        // Update elements each time UI system is rendered.
         foreach (var element in _elements)
         {
             if (element is not IUpdatableElement updatable) continue;
             updatable.Update();
         }
-    }
 
-    public void Render(RenderSystem renderer)
-    {
         foreach (var element in _elements)
         {
             if (element is IRenderableElement renderable)