When switching king position, don't redo moves player had undone

takhta.html

@@ -713,6 +713,7 @@
 				let blackQueen = blackKing === 'd8' ? 'e8' : 'd8';
 
 				// Undo all moves
+				let historylength = moveHistory.length;
 				while (moveHistory.length > 0) {
 					undoMove();
 				}
@@ -723,8 +724,8 @@
 				document.getElementById(blackKing).firstChild.data = '♚';
 				document.getElementById(blackQueen).firstChild.data = '♛';
 
-				// Redo all the moves we can
-				while (moveFuture.length > 0) {
+				// Redo until we can or until the point where we were before, whichever is first
+				while (moveHistory.length < historylength) {
 					if (!redoMove()) {
 						break;
 					}