Use WrapSize for WindowSize when unavailable

src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostRawUserInterface.cs

@@ -1653,7 +1653,17 @@ namespace Microsoft.PowerShell
         /// </summary>
         public override Size WindowSize
         {
-            get { return new Size(Console.WindowWidth, Console.WindowHeight); }
+            get
+            {
+                if (Console.IsOutputRedirected)
+                {
+                    return WrapSize;
+                }
+                else
+                {
+                    return new Size(Console.WindowWidth, Console.WindowHeight);
+                }
+            }
             set { Console.SetWindowSize(value.Width, value.Height); }
         }
 

src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterface.cs

@@ -1148,7 +1148,7 @@ namespace Microsoft.PowerShell
             // we leave a 1-cell margin on the end because if the very last character butts up against the 
             // edge of the screen buffer, then the console will wrap the line.
 
-            List<string> lines = WrapText(text, RawUI.BufferSize.Width - 1);
+            List<string> lines = WrapText(text, RawUI.WindowSize.Width - 1);
             int count = 0;
             foreach (string s in lines)
             {