Line break does not consider quotes in preview

When viewing a received plain text mail with quoted lines in it that are longer than the line-wrap limit, a line break will be inserted/forced.

Problem is that the resulting new line isn't marked up as a quote. Example:

> This is a long line of text that's also a quote.

That's how it's written in the mail. Let's say the line-break is forced after the word "text". That'll result in the preview looking as if it was written as:

> This is a long line of text
that's also a quote.

The 2nd half of the line will not be part of the quote anymore. That makes it all really hard to read, also because the highlighting is affected.