workflows: add a 'form_status_changed' variable

wcs/formdata.py

@@ -249,6 +249,8 @@ class FormData(StorableObject):
                 if evolution.status and evolution.status != self.status:
                     d['form_previous_status'] = self.get_status_label(evolution.status)
                     break
+        if d['form_status'] == d['form_previous_status']:
+            d['form_status_changed'] = True
 
         d.update(self.formdef.get_substitution_variables())
 

wcs/formdef.py

@@ -636,7 +636,9 @@ EmailsDirectory.register('change_user', N_('Notification of change to user'),
         default_body = N_('''\
 Hello,
 
+[if-any form_status_changed]
 Status of the form you submitted just changed (from "[before]" to "[after]").
+[end]
 
 [if-any user]
 You can consult it with this link: