Merge pull request #2413 from ayasa520/fix-scanp

fix: Memory leak caused by scanp command due to handler's reference of plugin instance

plugins/plugin_manager.py

@@ -151,6 +151,8 @@ def activate_plugins(self):  # 生成新开启的插件实例
                     self.disable_plugin(name)
                     failed_plugins.append(name)
                     continue
+                if name in self.instances:
+                    self.instances[name].handlers.clear()
                 self.instances[name] = instance
                 for event in instance.handlers:
                     if event not in self.listening_plugins:
@@ -165,6 +167,8 @@ def reload_plugin(self, name: str):
             for event in self.listening_plugins:
                 if name in self.listening_plugins[event]:
                     self.listening_plugins[event].remove(name)
+            if name in self.instances:
+                self.instances[name].handlers.clear()
             del self.instances[name]
             self.activate_plugins()
             return True