Comment 90 for bug 1468027

Yes, when the user language is e.g. English, the
69-language-selector-zh-*.conf files are not in effect.

But if I understand it correctly, the default (if that's the correct way to say it) of Noto is not Chinese, but Japanese. At least Japanese is listed first in a fc-match listing, when no fontconfig .conf files are in effect; please see:

https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1540063/comments/16

So possibly fonts-noto-cjk may result in proper rendering out of the box for any CJK language, as long as no fontconfig .conf file messes it up. That's why I found it worth a try to put those Japanese lines first in 64-language-selector-prefer.conf.

tomoe_musashi reported in comment #81 that if does not affect Chinese rendering. (The issue he mentioned - *Takao* used in Firefox for non-lang-specified content - appears to be unrelated.)

So, Aron, can you please test?

Sure, if the Japanese lines in 64-language-selector-prefer.conf affect Chinese rendering adversely, we should move them downwards (and with that make it worse for Japanese...). But there is no reason to prefer Chinese over Japanese just for the sake of it, is there?