Message preview with "Content-Transfer-Encoding: base64" wrong? #12228
Description
Steps to reproduce
The mail has set
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
and does render correctly when opening, just the preview shows the base64 encoded data?
Expected behavior
The preview should take base64 encoded data into account and show the actual contents.
Actual behavior
Base64 encoded data in preview.
Mail app version
5.7.0-beta.1
Nextcloud version
32.0.3
Mailserver or service
Exchange
Operating system
Debian 13
PHP engine version
Other
Nextcloud memory caching
APCu & Redis
Web server
Apache (supported)
Database
MariaDB
Additional info
PHP 8.4 is used. This is the first time the mailbox was connected to mail, so no idea if that is a regression.