[Quote builder] print to pdf 

- Task: https://www.odoo.com/web#id=9286&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.J3mShCzM9sV03MEw
I have test with hidden_print = False. Nothing change : a node with the class 'hidden-print' class is not rendered on the pdf (frontend, and backend). It think since the hidden-print come from  bootstrap, and since bootstrap lib is include in the header of the html converted in pdf, the element is not display. Correct me if I'm wrong. Maybe there is a case where you really need the hidden_print param, but I don't see it for now ...