Fix an IndexOutOfRangeException in VI mode (#1200)

Author: springcomp

PSReadLine/Movement.vi.cs

@@ -94,7 +94,15 @@ public static void ViNextGlob(ConsoleKeyInfo? key = null, object arg = null)
                 i = _singleton.ViFindNextGlob(i);
             }
 
-            _singleton.MoveCursor(Math.Min(i, _singleton._buffer.Length - 1));
+            int newPosition = Math.Min(i, Math.Max(0, _singleton._buffer.Length - 1));
+            if (newPosition != _singleton._current)
+            {
+                _singleton.MoveCursor(newPosition);
+            }
+            else
+            {
+                Ding();
+            }
         }
 
         /// <summary>

test/MovementTest.VI.cs

@@ -364,6 +364,16 @@ public void ViDotWordMovement()
                 ));
         }
 
+        [SkippableFact]
+        public void ViGlobMovement_EmptyBuffer_Defect1195()
+        {
+            TestSetup(KeyMode.Vi);
+
+            TestMustDing("", Keys(
+                _.Escape, "W" 
+            ));
+        }
+
         [SkippableFact]
         public void ViCursorMovement()
         {