ConsoleUI container size text

src/Library/TerminalUI/Controls/Grid.cs

@@ -214,7 +214,6 @@ public sealed class Grid<T> : ChildContainerView<Grid<T>, T>, IVisibilityChangeH
         int row,
         IReadOnlyList<IView> forceRerenderChildren)
     {
-        if (!viewsByPosition.TryGetValue((column, row), out var children)) return false;
 
         var width = columnWidths[column];
         var height = rowHeights[row];
@@ -239,6 +238,12 @@ public sealed class Grid<T> : ChildContainerView<Grid<T>, T>, IVisibilityChangeH
         }
 
         if (renderSize.Width == 0 || renderSize.Height == 0) return false;
+        
+        if (!viewsByPosition.TryGetValue((column, row), out var children))
+        {
+            RenderEmpty(context, renderPosition, renderSize);
+            return true;
+        }
 
         var needsRerender = children.Any(forceRerenderChildren.Contains);
         if (needsRerender)
@@ -270,7 +275,7 @@ public sealed class Grid<T> : ChildContainerView<Grid<T>, T>, IVisibilityChangeH
             }
         }
 
-        return true;
+        return needsRerender;
 
         static Position GetRenderPosition(
             Position gridPosition,

src/Library/TerminalUI/Controls/StackPanel.cs

@@ -99,6 +99,35 @@ public sealed partial class StackPanel<T> : ChildContainerView<StackPanel<T>, T>
                 : childSize.Width;
         }
 
+        if (Orientation == Orientation.Horizontal)
+        {
+            var leftWidth = size.Width - delta;
+            Span<char> text = stackalloc char[leftWidth];
+            text.Fill(ApplicationContext!.EmptyCharacter);
+
+            SetColorsForDriver(renderContext);
+            RenderText(
+                text,
+                renderContext.ConsoleDriver,
+                position with {X = position.X + delta},
+                size with {Width = leftWidth}
+            );
+        }
+        else
+        {
+            var leftHeight = size.Height - delta;
+            Span<char> text = stackalloc char[size.Width];
+            text.Fill(ApplicationContext!.EmptyCharacter);
+
+            SetColorsForDriver(renderContext);
+            RenderText(
+                text,
+                renderContext.ConsoleDriver,
+                position with {Y = position.Y + delta},
+                size with {Height = leftHeight}
+            );
+        }
+
         return neededRerender;
     }