feat: message.content 支持 mirai.MessageChain 对象 (#741)

pkg/pipeline/longtext/longtext.py

@@ -56,8 +56,19 @@ class LongTextProcessStage(stage.PipelineStage):
         await self.strategy_impl.initialize()
     
     async def process(self, query: core_entities.Query, stage_inst_name: str) -> entities.StageProcessResult:
-        if len(str(query.resp_message_chain)) > self.ap.platform_cfg.data['long-text-process']['threshold']:
+        # 检查是否包含非 Plain 组件
+        contains_non_plain = False
+
+        for msg in query.resp_message_chain:
+            if not isinstance(msg, Plain):
+                contains_non_plain = True
+                break
+        
+        if contains_non_plain:
+            self.ap.logger.debug("消息中包含非 Plain 组件，跳过长消息处理。")
+        elif len(str(query.resp_message_chain)) > self.ap.platform_cfg.data['long-text-process']['threshold']:
             query.resp_message_chain = MessageChain(await self.strategy_impl.process(str(query.resp_message_chain), query))
+
         return entities.StageProcessResult(
             result_type=entities.ResultType.CONTINUE,
             new_query=query