Add stable ids to types_de_champ after every update

spec/models/procedure_spec.rb

@@ -424,6 +424,11 @@ describe Procedure do
         expect(subject.path).to be_nil
       end
     end
+
+    it 'should keep types_de_champ ids stable' do
+      expect(subject.types_de_champ_ordered.first.id).not_to eq(procedure.types_de_champ_ordered.first.id)
+      expect(subject.types_de_champ_ordered.first.stable_id).to eq(procedure.types_de_champ_ordered.first.id)
+    end
   end
 
   describe '#publish!' do

spec/models/type_de_champ_shared_example.rb

@@ -39,6 +39,15 @@ shared_examples 'type_de_champ_spec' do
       it { is_expected.to allow_value('blabla').for(:description) }
     end
 
+    context 'stable_id' do
+      it {
+        type_de_champ = create(:type_de_champ_text)
+        expect(type_de_champ.id).to eq(type_de_champ.stable_id)
+        cloned_type_de_champ = type_de_champ.clone
+        expect(cloned_type_de_champ.stable_id).to eq(type_de_champ.stable_id)
+      }
+    end
+
     context 'remove piece_justificative_template' do
       context 'when the tdc is piece_justificative' do
         let(:template_double) { double('template', attached?: attached, purge_later: true) }