AST scanner: support nested calls

Original discovery and fix was made by @cantin:
kudelabs@9e8f4cc

lib/i18n/tasks/scanners/ruby_ast_call_finder.rb

@@ -50,9 +50,9 @@ def on_send(send_node)
       # use `any?` because `include?` checks type equality, but the receiver is a Parser::AST::Node != AST::Node.
       if valid_receivers && valid_receivers.any? { |r| r == receiver }
         @callback.call(send_node, @method_name)
-      else
-        handler_missing send_node
       end
+      # always invoke handler_missing to get nested translations in children
+      handler_missing send_node
       nil
     end
 

spec/fixtures/app/controllers/events_controller.rb

@@ -39,6 +39,9 @@ def show()
 
     # only `t()` calls can use relative keys and not `I18n.t()` calls.
     I18n.t('.not_relative')
+
+    # Nested calls in ruby files should be reported
+    I18n.t('nested.parent.rb', x: I18n.t('nested.child.rb'))
   end
 
   def update

spec/i18n_tasks_spec.rb

@@ -81,6 +81,8 @@
         scope.key_in_erb
         scope.relative.index.title
         reference-missing-target.a
+        nested.parent.rb
+        nested.child.rb
       ] + ['⮕ missing_target']
     end
     let :expected_missing_keys_diff do