FEATURE: allow disabling theme components (#7812)

This allows you to temporarily disable components without having to remove them from a theme. 

This feature is very handy when doing quick fix engineering.

app/controllers/admin/themes_controller.rb

@@ -156,8 +156,10 @@ class Admin::ThemesController < Admin::AdminController
     raise Discourse::InvalidParameters.new(:id) unless @theme
 
     original_json = ThemeSerializer.new(@theme, root: false).to_json
+    disables_component = [false, "false"].include?(theme_params[:enabled])
+    enables_component = [true, "true"].include?(theme_params[:enabled])
 
-    [:name, :color_scheme_id, :user_selectable].each do |field|
+    [:name, :color_scheme_id, :user_selectable, :enabled].each do |field|
       if theme_params.key?(field)
         @theme.public_send("#{field}=", theme_params[field])
       end
@@ -203,7 +205,13 @@ class Admin::ThemesController < Admin::AdminController
         update_default_theme
 
         @theme.reload
-        log_theme_change(original_json, @theme)
+
+        if (!disables_component && !enables_component) || theme_params.keys.size > 1
+          log_theme_change(original_json, @theme)
+        end
+        log_theme_component_disabled if disables_component
+        log_theme_component_enabled if enables_component
+
         format.json { render json: @theme, status: :ok }
       else
         format.json do
@@ -304,6 +312,7 @@ class Admin::ThemesController < Admin::AdminController
           :default,
           :user_selectable,
           :component,
+          :enabled,
           settings: {},
           translations: {},
           theme_fields: [:name, :target, :value, :upload_id, :type_id],
@@ -350,6 +359,14 @@ class Admin::ThemesController < Admin::AdminController
     StaffActionLogger.new(current_user).log_theme_setting_change(setting_name, previous_value, new_value, @theme)
   end
 
+  def log_theme_component_disabled
+    StaffActionLogger.new(current_user).log_theme_component_disabled(@theme)
+  end
+
+  def log_theme_component_enabled
+    StaffActionLogger.new(current_user).log_theme_component_enabled(@theme)
+  end
+
   def handle_switch
     param = theme_params[:component]
     if param.to_s == "false" && @theme.component?