[FIX] project: set date_assign at quick create

Set date_assign if a user is assigned to task
even if it is created from the wonderfull quick
create on kanban view.

addons/project/models/project.py

@@ -292,6 +292,14 @@ class Task(models.Model):
     _mail_post_access = 'read'
     _order = "priority desc, sequence, date_start, name, id"
 
+    @api.model
+    def default_get(self, field_list):
+        """ Set 'date_assign' if user_id is set. """
+        result = super(Task, self).default_get(field_list)
+        if 'user_id' in result:
+            result['date_assign'] = fields.Datetime.now()
+        return result
+
     def _get_default_partner(self):
         if 'default_project_id' in self.env.context:
             default_project_id = self.env['project.project'].browse(self.env.context['default_project_id'])