Remove session-based redirection

[yguedidi]

fixes #6944

easier to review commit by commit 😉

[j0k3r]

How is a link generated with the redirect attribute in it? I guess it's displayed in the URl? Won't this be too ugly?

[yguedidi]

The redirect GET parameter is indeed part of the URL, but it's not likely to be seen by users, because the links are actions that will redirect right after saving, so the parameter will not appear in the address bar as the user will end on the final URL, without the redirect param

[Kdecherf]

Looks good.

It should be noted that redirect can be a misleading term here: depending on the value of config_action_mark_as_read the redirect path may not be used.

[yguedidi]

It should be noted that redirect can be a misleading term here: depending on the value of config_action_mark_as_read the redirect path may not be used.

@Kdecherf you're right! merging to unblock the 2.6.8 release, could be renamed later, if we find a better name 😅