dossiers: displays an "Start an other dossier" item in action dropdown

app/views/users/dossiers/_dossier_actions.html.haml

@@ -1,5 +1,7 @@
 - has_delete_action = dossier.can_be_deleted_by_user?
-- has_actions = has_delete_action
+- has_new_dossier_action = dossier.procedure.expects_multiple_submissions? && dossier.procedure.accepts_new_dossiers?
+
+- has_actions = has_delete_action || has_new_dossier_action
 
 - if has_actions
   %span.dropdown.user-dossier-actions
@@ -7,6 +9,13 @@
       Actions
     .dropdown-content.fade-in-down
       %ul.dropdown-items
+        - if has_new_dossier_action
+          %li
+            = link_to procedure_lien(dossier.procedure) do
+              %span.icon.new-folder
+              .dropdown-description
+                Commencer un autre dossier
+
         - if has_delete_action
           %li.danger
             = link_to ask_deletion_dossier_path(dossier), method: :post, data: { disable: true, confirm: "En continuant, vous allez supprimer ce dossier ainsi que les informations qu’il contient. Toute suppression entraine l’annulation de la démarche en cours.\n\nConfirmer la suppression ?" } do