Fixed PowerShell#58: Multi-line commands rendering wrong

src/Microsoft.PowerShell.ConsoleGuiTools/ConsoleGui.cs

@@ -5,6 +5,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using OutGridView.Models;
 using Terminal.Gui;
 
@@ -164,6 +165,11 @@ private static string GetPaddedString(List<string> strings, int[] colWidths, int
                     builder.Append(' ');
                 }
 
+                // Replace any newlines with encoded newline (`n)
+                // Note we can't use Environment.Newline because we don't know that the
+                // Command honors that.
+                strings[i] = strings[i].Replace("\n", "`n");
+
                 // If the string won't fit in the column, append an ellipsis.
                 if (strings[i].Length > colWidths[i])
                 {