Cool. The new custom class that replaces the NList one is still a mess, though
For example, when i delete a message, the message does move to the deleted folder, but the message window still display the contents of this deleted message. Even if the next e-mail has been automatically selected by SimpleMail.
Also, there is another bug with quick filter and the new class.
Luckily there is the SIMPLEMAIL_OLDMAILLIST enviroment variable which allows the usage of the NList MUI class.