Fixing defect #263.

Author: srdubya

PSReadLine/Replace.vi.cs

@@ -129,7 +129,7 @@ private static void ViReplaceToEnd(ConsoleKeyInfo? key, object arg)
         {
             _singleton._groupUndoHelper.StartGroup(ViReplaceToEnd, arg);
             DeleteToEnd(key, arg);
-            _singleton._current++;
+            _singleton._current = Math.Min(_singleton._buffer.Length, _singleton._current + 1);
             _singleton.PlaceCursor();
             ViInsertMode(key, arg);
         }

UnitTestPSReadLine/BasicEditingTest.VI.cs

@@ -83,6 +83,12 @@ public void ViTestChangeMovement()
                 "lrylre", CheckThat(() => AssertLineIs("gOOD123ye")),
                 "hR45", _.Escape, CheckThat(() => AssertLineIs("gOOD12345"))
                 ));
+
+            Test("hello", Keys(
+                _.Escape, "Chello", _.Escape, CheckThat(() => AssertLineIs("hello")),
+                "0Cgoodbye", _.Escape, CheckThat(() => AssertLineIs("goodbye")),
+                'u'
+                ));
         }
 
         [TestMethod]