settings: add timer cleanup to prevent memory leaks

src/settings/setting/base.py

@@ -41,6 +41,8 @@ class BaseSetting:
         self._busy_count = 0
         self._widget_ready = False
         self._executor = get_executor()
+        self._timer_id = None
+        self._destroyed = False
 
         self.search_target = setting_data.get("search_target", None)
 
@@ -261,10 +263,18 @@ class BaseSetting:
             return
 
         def _poll():
+            if self._destroyed:
+                return False
             self._fetch_value_async(force=True)
             return True
 
-        GLib.timeout_add(int(interval * 1000), _poll)
+        self._timer_id = GLib.timeout_add(int(interval * 1000), _poll)
+
+    def destroy(self):
+        self._destroyed = True
+        if self._timer_id is not None:
+            GLib.source_remove(self._timer_id)
+            self._timer_id = None
 
     def _update_widget(self):
         if self.widget and self._widget_ready: