Oh, I use openSUSE Leap 15.0, just not 15.1 yet, and this bug is one of the reasons. I have been using *S[uU]SE since 1998 almost exclusively :-) I observed problems with fonts, but the one in Thunderbird was the most visible. On xfce4-terminal I observed what I think is called aliasing, but I'm not sure. My notes say "the '[' has a greenish tinct, and the ']' has a violet tinct". I tried both with nouveau driver and the proprietary driver. "YaST, letters do not look very nice. Seem wires, too thin."