Display email folders as a hierarchical list using the treelist widget with items sorted in a natural way:

1. Inbox and special-use folders (Drafts, Sent, Spam, Trash, Archive, etc.) on top
2. Remaining folders in alphabetical ascending order according their name (case-insensitive)

Special-use folder can be identified by their role attribute. See JMAP spec for defined roles.

User Story (U 1.3)

• Berna wants to open the message to the finance department she started writing this morning
• She opens the mail view
• The Inbox folder is currently selected
• She finds the Drafts folder as the second item in the folder list
• She clicks the Drafts folder
• The Inbox loses its selected state and now the Drafts folder indicates to be the currently selected folder