Preview Text encoding issues

[miaulalala]

Steps to reproduce

Follow Up to #6962 reported by @kesselb here

This email mail_5322.txt uses a weird encoding. It breaks the updatePreviewDataBulk process for me and rollback all changes.

The following code made it work. I'm not 100% sure if that's not a problem with my dev setup somehow.

$previewText = $message->getPreviewText();
if ($previewText !== null) {
    $previewText = mb_strcut(mb_convert_encoding($previewText, 'UTF-8', 'UTF-8'), 0, 255);
}

Expected behavior

The preview text is parsed correctly.

Actual behavior

Some encodings cause the preview text to fail.

Mail app version

1.14.0-alpha5

Mailserver or service

No response

Operating system

No response

PHP engine version

No response

Web server

No response

Database

No response

Additional info

No response

[ChristophWurst]

$previewText = $message->getPreviewText();
if ($previewText !== null) {
    $previewText = mb_strcut(mb_convert_encoding($previewText, 'UTF-8', 'UTF-8'), 0, 255);
}

Let's do that. Done. I had a stash somewhere with a similar solution. Anything non UTF-8 can be discarded.