The problem does not exist if fonts-wqy-microhei is installed, and fonts-wqy-zenhei and fonts-droid are both uninstalled.
I could also try a 14.04 LiveCD today to check if a "fresh system" has the same problem. Also, would it make sense to reinstall fonts-droid and try if I have the problem with a Chinese language locale?
The problem does not exist if fonts-wqy-microhei is installed, and fonts-wqy-zenhei and fonts-droid are both uninstalled.
I could also try a 14.04 LiveCD today to check if a "fresh system" has the same problem. Also, would it make sense to reinstall fonts-droid and try if I have the problem with a Chinese language locale?