From a75619b8e5b401686994ea44bc97f72615fb972e Mon Sep 17 00:00:00 2001
From: Calcitem <calcitem@outlook.com>
Date: Sat, 5 Dec 2020 10:55:41 +0800
Subject: [PATCH] =?UTF-8?q?flutter:=20=E8=A7=A3=E5=86=B3=20potison=20fen?=
 =?UTF-8?q?=20moves=20=E7=9A=84=20mvoes=20=E7=94=9F=E6=88=90=E7=BB=93?=
 =?UTF-8?q?=E6=9E=9C=E6=9C=89=E6=97=B6=E5=B8=A6=E5=90=83=E5=AD=90=E7=9D=80?=
 =?UTF-8?q?=E6=B3=95=E7=9A=84=E9=97=AE=E9=A2=98?=
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---
 src/ui/flutter/lib/mill/position.dart | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/ui/flutter/lib/mill/position.dart b/src/ui/flutter/lib/mill/position.dart
index a1d4f552..5f28ba5e 100644
--- a/src/ui/flutter/lib/mill/position.dart
+++ b/src/ui/flutter/lib/mill/position.dart
@@ -1494,16 +1494,19 @@ class Position {
   }
 
   String movesSinceLastRemove() {
-    //
+    int i;
     String moves = "";
     int posAfterLastRemove = 0;
 
     print("recorder.movesCount = ${recorder.movesCount}");
 
-    for (int i = recorder.movesCount - 1; i >= 0; i--) {
+    for (i = recorder.movesCount - 1; i >= 0; i--) {
       //if (recorder.moveAt(i).type == MoveType.remove) break;
       if (recorder.moveAt(i).move[0] == '-') break;
-      posAfterLastRemove = i;
+    }
+
+    if (i >= 0) {
+      posAfterLastRemove = i + 1;
     }
 
     print("[movesSinceLastRemove] posAfterLastRemove = $posAfterLastRemove");
@@ -1514,6 +1517,12 @@ class Position {
 
     print("moves = $moves");
 
+    var idx = moves.indexOf('-(');
+    if (idx != -1) {
+      print("moves[$idx] is -(");
+      assert(false);
+    }
+
     return moves.length > 0 ? moves.substring(1) : '';
   }