Folder hierarchy broken on special folders corner case

[alecpl]

If you have such a list of folders:

S: * LIST (\HasChildren) "/" INBOX
S: * LIST (\HasNoChildren) "/" INBOX/aaa
S: * LIST (\HasChildren) "/" INBOX/Junk
S: * LIST (\HasNoChildren) "/" INBOX/Junk/sub-junk
S: * LIST (\HasNoChildren) "/" INBOX/next
...

And you set junk_mbox = "INBOX/Junk", the hierarchy on the list of folders (in Settings and anywhere else) will be broken. The Junk folder will not appear as a top-level folder and "INBOX/next" will be in a wrong place.

The server has no personal namespace prefix (but allows creating folders under INBOX).

[alecpl]

Fixed. Not planned to be backported as it's a heavy change.