Those fields were empty in case the Attachment instance was created in an extension (Mail to Ticket for example).
Now the values are set in the object DBInsertNoReload method :
* creation_date : current date
* user_id : current user
The previous values set for console and portal are removed.
A fix for Mail to Ticket extension is also planned : N°4081.
* Remove XFrame header set in \WebPage::no_cache : not this method responsability, was confusing :/
* Remove no_cache() calls when already set in page constructor (ajax_page mainly)
* Also calls everywhere the \WebPage::no_cache method instead of setting headers manually
- add a specific container for attachments list, upload button and #attachment_plugin hidden input is outside of it
- refactor code between abstract class and implementation, add some comments
- now refreshes only the attachment list instead of the whole content
