DEV: Add save button to editing typed objects theme setting route (#26133)

Why this change?

This is still a work in progress but allows objects type theme setting
to be saved.

spec/system/page_objects/pages/admin_customize_themes.rb

@@ -15,6 +15,20 @@ module PageObjects
         has_css?(".select-inactive-mode")
       end
 
+      def has_overridden_setting?(setting_name)
+        has_css?(overridden_setting_selector(setting_name))
+      end
+
+      def has_no_overriden_setting?(setting_name)
+        has_no_css?(overridden_setting_selector(setting_name))
+      end
+
+      def reset_overridden_setting(setting_name)
+        setting_section = find("section.theme.settings .setting[data-setting=\"#{setting_name}\"]")
+        setting_section.click_button(I18n.t("admin_js.admin.settings.reset"))
+        setting_section.find(".setting-controls .ok").click
+      end
+
       def click_select_inactive_mode
         find(".select-inactive-mode").click
       end
@@ -41,12 +55,19 @@ module PageObjects
 
       def click_edit_objects_theme_setting_button(setting_name)
         find(".theme-setting[data-setting=\"#{setting_name}\"] .setting-value-edit-button").click
+        PageObjects::Pages::AdminObjectsThemeSettingEditor.new
       end
 
       def click_theme_settings_editor_button
         click_button(I18n.t("admin_js.admin.customize.theme.settings_editor"))
         PageObjects::Components::AdminThemeSettingsEditor.new
       end
+
+      private
+
+      def overridden_setting_selector(setting_name)
+        "section.theme.settings .setting.overridden[data-setting=\"#{setting_name}\"]"
+      end
     end
   end
 end

spec/system/page_objects/pages/admin_objects_theme_setting_editor.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module PageObjects
+  module Pages
+    class AdminObjectsThemeSettingEditor < PageObjects::Pages::Base
+      def has_setting_field?(field_name, value)
+        expect(input_field(field_name).value).to eq(value)
+      end
+
+      def fill_in_field(field_name, value)
+        input_field(field_name).fill_in(with: value)
+        self
+      end
+
+      def save
+        click_button(I18n.t("js.save"))
+        self
+      end
+
+      private
+
+      def input_field(field_name)
+        page.find(".schema-field[data-name=\"#{field_name}\"] input")
+      end
+    end
+  end
+end