Undo and Redo Operations Functional, with some caveats

SpriteMapEditor/SpriteMapModifications/MoveBounds.cs

@@ -14,9 +14,12 @@ namespace SpriteMapEditor.SpriteMapModifications
         private readonly int xDiff;
         private readonly int yDiff;
 
+        private List<int> preChangeSelection;
+        private List<int> postChangeSelection;
+
         public MoveBounds(List<SpriteMapRegion> spritesToMove, int xDifference, int yDifference)
         {
-            sprites = spritesToMove;
+            sprites = spritesToMove.ToList();
             xDiff = xDifference;
             yDiff = yDifference;
         }
@@ -41,5 +44,27 @@ namespace SpriteMapEditor.SpriteMapModifications
                 sprite.Bounds = newBounds;
             }
         }
+
+        public List<int> GetPreChangeSelection()
+        {
+            return preChangeSelection;
+        }
+        public void SetPreChangeSelection(List<int> currentSelection)
+        {
+            preChangeSelection = currentSelection;
+        }
+        public List<int> GetPostChangeSelection()
+        {
+            return postChangeSelection;
+        }
+        public void SetPostChangeSelection(List<int> currentSelection)
+        {
+            postChangeSelection = currentSelection;
+        }
+
+        public override string ToString()
+        {
+            return "Move Sprite Bounds";
+        }
     }
 }