From 6d201116a800866d91640ef225831d21f74ad116 Mon Sep 17 00:00:00 2001
From: Calcitem <calcitem@outlook.com>
Date: Fri, 27 Nov 2020 00:51:47 +0800
Subject: [PATCH] =?UTF-8?q?flutter:=20recorder=20=E5=A6=82=E6=9E=9C?=
 =?UTF-8?q?=E6=8F=92=E5=85=A5=E5=92=8C=E4=B8=8A=E7=9D=80=E7=9B=B8=E5=90=8C?=
 =?UTF-8?q?=E7=9A=84=E7=9D=80=E6=B3=95=E5=88=99=20assert?=
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---
 src/ui/flutter/lib/mill/recorder.dart | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ui/flutter/lib/mill/recorder.dart b/src/ui/flutter/lib/mill/recorder.dart
index 2d31828e..60dfe13e 100644
--- a/src/ui/flutter/lib/mill/recorder.dart
+++ b/src/ui/flutter/lib/mill/recorder.dart
@@ -59,6 +59,10 @@ class GameRecorder {
       fullMove++;
     }
 
+    if (_history.length > 0) {
+      assert(_history[_history.length - 1].move != move.move);
+    }
+
     _history.add(move);
 
     if (move.type == MoveType.remove) {