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imap4rev2: Allow and send UTF-8 in quoted strings - #1708

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mbettini-ox wants to merge 7 commits into
dovecot:mainfrom
mbettini-ox:DOV-7425
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mbettini-ox wants to merge 7 commits into
dovecot:mainfrom
mbettini-ox:DOV-7425

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…fields_dropped

Cache purge drops legacy mime.parts entries once mime.parts.v2 exists
(DOV-7425); the count makes that reclaim visible per purge.
The setting exists since 2.4.2 but had no entry, so the UTF8=ACCEPT
notes could only name IMAP4rev2 without linking to how it is enabled.
The new cache fields are only written above the gate, so the rollback
rule and the cost of staying below it belong next to the setting.
FETCH and URLFETCH output differs per session for the same mail, and the
attachment keywords may appear for UTF-8 sessions only, which support
needs to be able to explain.
…che fields

DOV-7425 adds them for message/global support in UTF8=ACCEPT sessions.
Admins see them in doveadm dump and need to know that the cache field
settings keep working with the legacy names only.
Raising dovecot_storage_version switches the cache to mime.parts.v2, and
the upgrade page is where admins look for what a rollback can still read.
…ocumentation

imap4rev2_enable exists since 2.4.2; the mime.parts.v2 cache fields, the
storage version gate and the UTF8=ACCEPT notes are new in 2.4.6.
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