Progress bar header and footer (#1262)

src/Spectre.Console/Widgets/ControlCode.cs

@@ -1,19 +1,28 @@
 namespace Spectre.Console;
 
-internal sealed class ControlCode : Renderable
+/// <summary>
+/// A control code.
+/// </summary>
+public sealed class ControlCode : Renderable
 {
     private readonly Segment _segment;
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ControlCode"/> class.
+    /// </summary>
+    /// <param name="control">The control code.</param>
     public ControlCode(string control)
     {
         _segment = Segment.Control(control);
     }
 
+    /// <inheritdoc />
     protected override Measurement Measure(RenderOptions options, int maxWidth)
     {
         return new Measurement(0, 0);
     }
 
+    /// <inheritdoc />
     protected override IEnumerable<Segment> Render(RenderOptions options, int maxWidth)
     {
         if (options.Ansi)

src/Spectre.Console/Widgets/Rows.cs

@@ -63,7 +63,7 @@ public sealed class Rows : Renderable, IExpandable
 
                 if (last)
                 {
-                    if (!segment.IsLineBreak)
+                    if (!segment.IsLineBreak && child is not ControlCode)
                     {
                         result.Add(Segment.LineBreak);
                     }