imap ---- LIST "" * The returned mailbox does not display quotes

[lty]

dovecot version 

v2.2.29 

v2.2.36 

v2.3.5 

LIST "" * The returned mailbox does not display quotes 

dovecot version 

v2.1.17 

LIST "" * The returned mailbox shows quotation marks 

Why is the quotation mark removed in the new version? 

Is there any configuration option in the new version to add quotes? 

Because I see a lot of big public mailboxes with quotation marks.

 
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