Show preview of contents of mails earlier
aec4782a23d1
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Show preview of contents of mails earlier

* src/keycache.cpp (do_populate): Also cache the current config.
(get_cached_config, KeyCache::setConfig): New.
(KeyCache::protocolIsOnline): Check if an operation might require
an online connection.
* src/mail.cpp (Mail::add_attachments_o): Only add attachments
once.
(do_parsing): Handle preview.
(Mail::decryptVerify_o): Insert verify placeholder for
multipart signed with body.
(Mail::updateBody_o): Handle preview.
(Mail::parsingDone_o): Rename to make it clear that its OOM based.
Handle preview.
(Mail::isSMIME): Add non MAPI variant.
(Mail::getOriginalBody): New accessor.
(ParseController::parse): Add offline mode.
(gpgol_window_proc): New. SHOW_PREVIEW message.
* tests/run-parser.cpp (main): Use offline mode.

This adds a new mode for GpgOL that it shows unverified content
already, but the signature state is only updated after the
verification is done. So there should not be a security issue.

This will help in cases where the initial start of gpg-agent and
dirmngr takes a while or when CRL's are fetched. On a fast system
or in offline mode it should rarely be visible.