fixed elements crossing chunk borders

Scripts/Chunk.cs

@@ -111,21 +111,19 @@ public class Chunk {
     }
 
     private void Swap(Element what, Element swapTo) {
-        Element swap = new Element(what);
-
-        GD.Print($"Swap: {what} -> {swapTo}");
-        if (swapTo.Position.Y == 0) GD.Print($"");
-
-        if (what == null || swapTo == null) return;
+        if (what == null || swapTo == null) {
+            GD.PrintErr("Trying to swap null");
+            return;
+        }
+        Element temp = new Element(what);
 
         what.Position = swapTo.Position;
         what.Chunk = swapTo.Chunk;
-        Elements[swapTo.Position.X, swapTo.Position.Y] = what;
-
-        swapTo.Position = swap.Position;
-        swapTo.Chunk = swap.Chunk;
-        Elements[swap.Position.X, swap.Position.Y] = swapTo;
+        what.Chunk.Elements[what.Position.X, what.Position.Y] = what;
 
+        swapTo.Position = temp.Position;
+        swapTo.Chunk = temp.Chunk;
+        swapTo.Chunk.Elements[swapTo.Position.X, swapTo.Position.Y] = swapTo;
 
         what.Active = true;
         swapTo.Active = true;