[Core] fix forward sent by the old client is preceded by extra elements (#835)

Author: DarkRRb

Lagrange.Core/Internal/Service/Message/PushMessageService.cs

@@ -329,6 +329,11 @@ private static void ProcessEvent0x210(Span<byte> payload, PushMsg msg, List<Prot
                 }
                 break;
             }
+            case Event0x210SubType.FriendRecallPoke:
+            {
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
+                break;
+            }
             default:
             {
                 break;
@@ -382,5 +387,6 @@ private enum Event0x210SubType
         ServicePinChanged = 199, // e.g: My computer | QQ Wallet | ...
         FriendPokeNotice = 290,
         GroupKickNotice = 212,
+        FriendRecallPoke = 321,
     }
 }

Lagrange.Core/Message/Entity/ForwardEntity.cs

@@ -113,7 +113,7 @@ IEnumerable<Elem> PackElement(bool additional)
 
     void IMessageEntity.SetSelfUid(string selfUid) => _selfUid = selfUid;
 
-    string IMessageEntity.ToPreviewString() => $"[Forward] {{ {Chain.ToPreviewString()} }}";
+    string IMessageEntity.ToPreviewString() => $"[Forward] {{ {Chain.Sequence} }}";
 
     string IMessageEntity.ToPreviewText() => "";
 }

Lagrange.Core/Message/Filter/MessageFilter.cs

@@ -16,6 +16,7 @@ internal static class MessageFilter
     static MessageFilter()
     {
         _rules = new IMessageFilterRule[] {
+            new AtBeforeForwardInOldClient(),
             new ForwardTrailingAtAndTextFilterRule(),
             new MultiMsgTrailingXmlFilterRule(),
             new OldAndInvalidImageFilterRule(),

Lagrange.Core/Message/Filter/Rule/AtBeforeForwardInOldClient.cs

@@ -0,0 +1,18 @@
+
+using Lagrange.Core.Message.Entity;
+
+namespace Lagrange.Core.Message.Filter.Rule;
+
+public class AtBeforeForwardInOldClient : IMessageFilterRule
+{
+    public IEnumerable<int> Apply(MessageChain chain)
+    {
+        if (chain.Count < 3) return Array.Empty<int>();
+        if (chain[0] is not MentionEntity mention) return Array.Empty<int>();
+        if (chain[1] is not TextEntity { Text: " " }) return Array.Empty<int>();
+        if (chain[2] is not ForwardEntity forward) return Array.Empty<int>();
+        if (mention.Uin != forward.TargetUin) return Array.Empty<int>();
+
+        return new int[] { 0, 1 };
+    }
+}