🩹 fix reply process in mirai adapter

nonebot/adapters/mirai/message.py

@@ -289,6 +289,19 @@ class MessageChain(BaseMessage):
                 f'Type {type(message).__name__} is not supported in mirai adapter.'
             )
 
+    @overrides(BaseMessage)
+    def reduce(self):
+        """
+        :说明:
+
+          忽略为空的消息段, 合并相邻的纯文本消息段
+        """
+        for index, segment in enumerate(self):
+            segment: MessageSegment
+            if segment.is_text() and not str(segment).strip():
+                self.pop(index)
+        super().reduce()
+
     @overrides(BaseMessage)
     def _construct(
         self, message: Union[List[Dict[str, Any]], Iterable[MessageSegment]]
@@ -310,6 +323,15 @@ class MessageChain(BaseMessage):
         ]
 
     def extract_first(self, *type: MessageType) -> Optional[MessageSegment]:
+        """
+        :说明:
+
+          弹出该消息链的第一个消息
+        
+        :参数:
+
+          * `*type: MessageType`: 指定的消息类型, 当指定后如类型不匹配不弹出
+        """
         if not len(self):
             return None
         first: MessageSegment = self[0]

nonebot/adapters/mirai/utils.py

@@ -168,10 +168,11 @@ def process_reply(bot: "Bot", event: GroupMessage) -> GroupMessage:
 
 async def process_event(bot: "Bot", event: Event) -> None:
     if isinstance(event, MessageEvent):
+        event.message_chain.reduce()
         Log.debug(event.message_chain)
         event = process_source(bot, event)
         if isinstance(event, GroupMessage):
             event = process_nick(bot, event)
-            event = process_reply(bot, event)
             event = process_at(bot, event)
+            event = process_reply(bot, event)
     await handle_event(bot, event)