address feedback

Author: SteveL-MSFT

PSReadLine/Render.cs

@@ -50,6 +50,9 @@ class RenderData
             lines = new[] { new RenderedLineData{ columns = 0, line = ""}}
         };
         private int _initialX;
+
+        // This represents the initial Y position of the cursor.  If this position has scrolled off screen, this value will be negative indicating
+        // the number of lines off screen.
         private int _initialY;
         private ConsoleColor _initialForeground;
         private ConsoleColor _initialBackground;
@@ -436,8 +439,8 @@ int PhysicalLineCount(int columns, bool isFirstLogicalLine, out int lenLastPhysi
                 var lineData = renderLines[logicalLine];
                 var physicalLineCount = PhysicalLineCount(lineData.columns, logicalLine == 0, out var lenLastLine);
 
-                // If the initial position was scrolled off the screen, only output for lines still
-                // in the screen buffer
+                // If the initial position was scrolled off the screen, _initialY will be negative.
+                // Only output for lines still in the screen buffer.
                 if (_initialY + physicalLine >= 0)
                 {
                     // First time redrawing from the top

test/KillYankTest.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Text;
 using System.Windows;
 using Microsoft.PowerShell;
 using Xunit;
@@ -313,6 +314,23 @@ public void Paste()
                 "echo foobar", _.CtrlShiftLeftArrow, _.CtrlV));
         }
 
+        [Fact]
+        public void PasteLarge()
+        {
+            TestSetup(KeyMode.Cmd);
+
+            StringBuilder text = new StringBuilder();
+            text.Append("@{");
+            for (int i = 0; i < _console.BufferHeight + 10; i++)
+            {
+                text.Append(string.Format("prop{0}={0}", i));
+            }
+            text.Append("}");
+
+            Clipboard.SetText(text.ToString());
+            Test(text.ToString(), Keys(_.CtrlV));
+        }
+
         [Fact]
         public void Cut()
         {