ugly fonts in thunderbird after sid upgrade

[Pétur Viljamson <peturvilj@gmail.com>]

I have ugly fonts in thunderbird after updating my Debian sid today.

It happens both in the body of mail (received and sent) and in the
interface. The problem is also present on my second computer with
different hardware but some software (Xfce + Debian sid).

This mail was rejected by the Debian mailing list the first time with the error

"550 5.6.0 improper use of 8-bit data in message header"

so I am gessing the font problem must be a encoding one.

The update did not delete any package. It must be a bug.

See ugly fonts screenshots:
https://ncloud.zaclys.com/index.php/s/LcuSZeD5yblc7ac/download