fix (#2299)

Author: alainm23

src/Dialogs/Preferences/Pages/Appearance.vala

@@ -184,19 +184,25 @@ public class Dialogs.Preferences.Pages.Appearance : Dialogs.Preferences.Pages.Ba
                                                                    system_appearance_switch.active);
         })] = system_appearance_switch;
 
-        signal_map[light_radio.toggled.connect (() => {
-            Services.Settings.get_default ().settings.set_boolean ("dark-mode", false);
-            Services.Settings.get_default ().settings.set_enum ("appearance", 0);
+        signal_map[light_radio.notify["active"].connect (() => {
+            if (light_radio.active) {
+                Services.Settings.get_default ().settings.set_boolean ("dark-mode", false);
+                Services.Settings.get_default ().settings.set_enum ("appearance", 0);
+            }
         })] = light_radio;
 
-        signal_map[dark_radio.toggled.connect (() => {
-            Services.Settings.get_default ().settings.set_boolean ("dark-mode", true);
-            Services.Settings.get_default ().settings.set_enum ("appearance", 1);
+        signal_map[dark_radio.notify["active"].connect (() => {
+            if (dark_radio.active) {
+                Services.Settings.get_default ().settings.set_boolean ("dark-mode", true);
+                Services.Settings.get_default ().settings.set_enum ("appearance", 1);
+            }
         })] = dark_radio;
 
-        signal_map[blue_radio.toggled.connect (() => {
-            Services.Settings.get_default ().settings.set_boolean ("dark-mode", true);
-            Services.Settings.get_default ().settings.set_enum ("appearance", 2);
+        signal_map[blue_radio.notify["active"].connect (() => {
+            if (blue_radio.active) {
+                Services.Settings.get_default ().settings.set_boolean ("dark-mode", true);
+                Services.Settings.get_default ().settings.set_enum ("appearance", 2);
+            }
         })] = blue_radio;
 
         uint update_timeout_id = 0;