prevent cursor from disappearing on manipulation cancel

Author: bhtruong93

Assets/HoloToolkit/Input/Scripts/Cursor/Cursor.cs

@@ -417,10 +417,14 @@ public virtual CursorStateEnum CheckCursorState()
         {
             if (cursorState != CursorStateEnum.Contextual)
             {
-                if (IsInputSourceDown)
+                if (IsInputSourceDown && visibleHandsCount > 0)
                 {
                     return CursorStateEnum.Select;
                 }
+                else if (IsInputSourceDown && visibleHandsCount == 0)
+                {
+                  IsInputSourceDown = false;
+                }
                 else if (cursorState == CursorStateEnum.Select)
                 {
                     return CursorStateEnum.Release;
@@ -444,4 +448,4 @@ public virtual void OnCursorStateChange(CursorStateEnum state)
             cursorState = state;
         }
     }
-}
+}