DEV: Add the missing app subdirectory (#9499)

* DEV: Add missing  directory to the Discourse ember app

* DEV: Resolve imports correctly

lib/discourse_js_processor.rb

@@ -161,7 +161,8 @@ JS
         path = "discourse/plugins/#{plugin.name}/#{logical_path.sub(/javascripts\//, '')}" if plugin
       end
 
-      path || logical_path
+      # We need to strip the app subdirectory to replicate how ember-cli works.
+      path || logical_path&.gsub('app/', '')
     end
 
   end

lib/freedom_patches/raw_handlebars.rb

@@ -65,7 +65,11 @@ class Ember::Handlebars::Template
   end
 
   def global_template_target(namespace, module_name, config)
-    "#{namespace}[#{template_path(module_name, config).inspect}]"
+    # We need this for backward-compatibility reasons.
+    # Plugins may not have an app subdirectory.
+    path = template_path(module_name, config).inspect.gsub('discourse/templates/', '')
+
+    "#{namespace}[#{path}]"
   end
 
   # FIXME: Previously, ember-handlebars-templates uses the logical path which incorrectly

lib/pretty_text.rb

@@ -81,8 +81,8 @@ module PrettyText
     ctx_load_manifest(ctx, "markdown-it-bundle.js")
     root_path = "#{Rails.root}/app/assets/javascripts/"
 
-    apply_es6_file(ctx, root_path, "discourse/lib/to-markdown")
-    apply_es6_file(ctx, root_path, "discourse/lib/utilities")
+    apply_es6_file(ctx, root_path, "discourse/app/lib/to-markdown")
+    apply_es6_file(ctx, root_path, "discourse/app/lib/utilities")
 
     PrettyText::Helpers.instance_methods.each do |method|
       ctx.attach("__helpers.#{method}", PrettyText::Helpers.method(method))