widgets: block signal handlers during UI init

src/settings/setting/widgets/ChoiceWidget.py

@@ -33,6 +33,7 @@ class ChoiceWidget(BaseWidget):
 
     def _rebuild_items(self):
         items = list(self.setting.map.keys()) if self.setting.map else []
+        with self.dropdown.handler_block(self.handler_id):
             self.model.splice(0, self.model.get_n_items(), items)
         self.dropdown.set_sensitive(bool(items))
 

src/settings/setting/widgets/NumStepper.py

@@ -58,6 +58,7 @@ class NumStepper(BaseWidget):
         map_data = self.setting.map or {}
         lower, upper, step, digits = self._get_range_values(map_data)
         adjustment = self.spin.get_adjustment()
+        with self.spin.handler_block(self.spin_handler_id):
             adjustment.set_lower(lower)
             adjustment.set_upper(upper)
             adjustment.set_step_increment(step)

src/settings/setting/widgets/ThemeChooserWidget.py

@@ -186,6 +186,7 @@ class ThemeChooserWidget(BaseWidget):
             self.theme_cards[value] = flowbox_child
 
             if value == current_value:
+                with GObject.signal_handler_block(self.flowbox, self.handler_id):
                     self.flowbox.select_child(flowbox_child)
 
     def _create_color_preview(self, value):