Well, I updated to 4.32 and sideloaded both
Noto Sans and Serif CJK fonts but whenever I try to scroll down to them in either the main or supplemental font menus, it makes my Glo HD reboot. I guess they're too big?
Anyways, some observations with the supplemental fonts.
There is a limit of four supplemental fonts that you can select.
I also have this novel (
Altina the Sword Princess from J-Novel Club) that uses some special unicode symbol as a section divider (it looks like a four-pointed star). It doesn't appear with Georgia, but it does appear with a more unicode aware font like
Kurinto Text. Using Kurinto as the main font renders fine, but setting Georgia as the main font and Kurinto as the supplementary font does not; I still get the blank squares.
Then I tried DomesticExtremis'
EPUB Feature Peeker. It doesn't seem to work on the Special Characters section, but stuff seems to happen in the Non-Latin Scripts sections.
From what I can tell in terms of difference, the Non-Latin Scripts sections specifies a language encoding for the text blocks (ex. <div xml:lang="ja" xmlns:xml="http://www.w3.org/XML/1998/namespace"> for Japanese) while the plain special characters do not.
So my question is: Is this how it's supposed to work? That supplemental fonts only work when a language encoding is specified (I guess that's what the new strickle binary is for)? Or am I doing things wrong? Is there any way to get special characters without a language encoding defined to display? Am I crazy?
You can test things yourself with the epub in the links.