fix(dossier): do not warn about closed demarche when updating a fork

app/helpers/dossier_helper.rb

@@ -34,6 +34,7 @@ module DossierHelper
   end
 
   def dossier_submission_is_closed?(dossier)
+    return false if dossier.editing_fork?
     dossier.brouillon? && dossier.procedure.close?
   end
 

spec/helpers/dossier_helper_spec.rb

@@ -133,6 +133,13 @@ RSpec.describe DossierHelper, type: :helper do
 
       it_behaves_like "returns false"
     end
+
+    context "when dossier is an editing fork" do
+      let(:user) { create(:user) }
+      let(:dossier) { create(:dossier, :en_construction, user:).find_or_create_editing_fork(user) }
+
+      it_behaves_like "returns false"
+    end
   end
 
   describe '.dossier_display_state' do