not writable

[Tom Vincent]

I've noticed this happen frequently on the INBOX directory of Gmail
accounts.

The following debug snippet seems to show it switches between
"READ-WRITE" and "READ" statuses:

---

Folder INBOX [acc: gmail]:
 DEBUG[imap]:   38:47.91 Folder INBOX [acc: gmail] [sync] SELECT ('INBOX',)
 DEBUG[imap]:   38:47.91 Folder INBOX [acc: gmail] state_change_pending.acquire
 DEBUG[imap]:   38:47.91 Folder INBOX [acc: gmail] _request_push(MDBI52, SELECT, {}) = MDBI52
 DEBUG[imap]:   38:47.91 Folder INBOX [acc: gmail] data=MDBI52 SELECT INBOX
 DEBUG[imap]:   38:47.91 Folder INBOX [acc: gmail] SELECT:MDBI52.ready.wait
 DEBUG[imap]:   38:47.91 imap.gmail.com writer > MDBI52 SELECT INBOX\r\n
 DEBUG[imap]:   38:48.32 imap.gmail.com reader < MDBI52 OK [READ-WRITE] INBOX selected. (Success)\r\n
 DEBUG[imap]:   38:48.32 imap.gmail.com handler _request_pop(MDBI52, ('OK', ['[READ-WRITE] INBOX selected. (Success)'])) = MDBI52
Folder INBOX [acc: gmail]:
 DEBUG[imap]:   38:48.32 Folder INBOX [acc: gmail] state => SELECTED
 DEBUG[imap]:   38:48.32 Folder INBOX [acc: gmail] state_change_pending.release
 DEBUG[imap]:   38:48.32 Folder INBOX [acc: gmail] _get_untagged_response(READ-ONLY) => ['']
 DEBUG[imap]:   38:48.32 Folder INBOX [acc: gmail] untagged responses dump:
 ERROR: Server 'imap.gmail.com' closed connection, error on SELECT 'INBOX'. Server said: INBOX is not writable
 DEBUG[thread]: Unregister thread 'Folder INBOX [acc: gmail]'
 ERROR: Server 'imap.gmail.com' closed connection, error on SELECT 'INBOX'. Server said: INBOX is not writable

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$ offlineimap --version                     
6.4.0