Lines not wrapped when replying to HTML message (TinyMCE)

[windkracht8]

Hi all,

I have an issue with line length after upgrading to version 1.7.0. The issue is that when I reply or forward an HTML message that has a very long line (more than 1000 characters), that this line is unwrapped when creating the reply, and not wrapped again when sending the message, resulting in my server rejecting the message.

The message I am replying to has a few very long html lines in the body, with some links and styling. When I export the original message, this line shows as properly wrapped at every 76th character.

To check what is happening I created a reply and immediately store it as a draft. When I export this draft, I can see that none of the lines in the message are wrapped and one of them is over 1000 characters. When I try to send such a message my server rejects the message because lines cannot go over 998 octets.

Leading to my conclusion that when I create a reply the lines are unwrapped, and they are not rewrapped before sending it to my server. This has started to happen after updating to version 1.7.0 of roundcube, so it's likely that it has something to do with something that has changed.

Can I get some help to figure out what is going wrong? I am not sure where to start to search for the issue.

[windkracht8]

Source of my issue is this commit: https://github.com/roundcube/roundcubemail/commit/374a4a5e25048f99cbded5be3fb7edec0605885f
It changes Mail_mime 'html_encoding' parameter from a fixed 'quoted-printable', to 8bit for most cases. Mail_mime does not wrap lines for 8bit, only when html_encoding is quoted-printable or base64.

I will add my finding to the original issue on Github as well.