Ensure SCSS compilation compatibility with core (#77)

* WIP: Fix for new Discourse

* Ensure SCSS compilation compatibility with core

Co-authored-by: Faizaan Gagan <fzngagan@gmail.com>

plugin.rb

@@ -174,10 +174,15 @@ after_initialize do
   ::Wizard::Step.prepend CustomWizardStepExtension
 
   full_path = "#{Rails.root}/plugins/discourse-custom-wizard/assets/stylesheets/wizard/wizard_custom.scss"
+  if Stylesheet::Importer.respond_to?(:plugin_assets)
+    Stylesheet::Importer.plugin_assets['wizard_custom'] = Set[full_path]
+  else
+    # legacy method, Discourse 2.7.0.beta5 and below
     DiscoursePluginRegistry.register_asset(full_path, {}, "wizard_custom")
     Stylesheet::Importer.register_import("wizard_custom") do
       import_files(DiscoursePluginRegistry.stylesheets["wizard_custom"])
     end
+  end
 
   CustomWizard::CustomField::CLASSES.keys.each do |klass|
     add_model_callback(klass, :after_initialize) do

views/layouts/wizard.html.erb

@@ -30,7 +30,7 @@
     <%= tag.meta id: 'data-discourse-setup', data: client_side_setup_data %>
 
     <meta name="discourse_theme_ids" content="<%= wizard_theme_ids&.join(",") %>">
-    <meta name="discourse-base-uri" content="<%= Discourse.base_uri %>">
+    <meta name="discourse-base-uri" content="<%= Discourse.base_path %>">
 
     <%= render partial: "layouts/head" %>
     <title><%= wizard_page_title %></title>