Fonts without a "ẞ" are still displayed with "German" language filter

[thlinard]

Describe the issue
According to https://github.com/googlefonts/lang/blob/main/Lib/gflanguages/data/languages/de_Latn.textproto (#153), ẞ is a required character and glyph for German support.

However, with the new language filter system on the website, if you select "German", you get fonts that do not have a ẞ.

To Reproduce
Select the language filter "German" and put an ẞ in Preview, like this: https://fonts.google.com/?preview.text=%E1%BA%9E&lang=de_Latn

[emmamarichal]

I still see not_required: "ẞ" in the .textproto.

But indeed, this character is now considered as the official one (instead of SS).
There were discussions about this a few weeks ago, @davelab6, what were the conclusions? Should we work on updating this filter, so that fonts that don't have this character are removed from the list?

[thlinard]

I still see not_required: "ẞ" in the .textproto.

Oh, my mistake. "ẞ" is both in "base" (what misled me) and in "not_required".

But indeed the conclusion of (#153) was to make it a required character.

[emmamarichal]

Yes, I don't know yet for the old fonts, but for the new ones, this character is definitely required :)

[thlinard]

Dave was more specific in (#152):

Alright, I am convinced that, if a user searches for fonts that support German, and then Roboto, Poppins, Lato etc should not come up.

[emmamarichal]

@davelab6 @chrissimpkins I let you plan/assign this work!

[chrissimpkins]

Discussed with Nate today. The filter fix is in progress.