Re: script-representative-chars vs incomplete fonts

[Kévin Le Gouguec]

Eli Zaretskii <eliz@gnu.org> writes:

>> The docstring also says this:
>> 
>>     If it is a list, all characters in the list are necessary for
>>     supporting SCRIPT.
>>     If it is a vector, one of the characters in the vector is necessary.
>
> So you want to require both upper- and lower-case variants?

As a mitigation against fonts like KpMath, yes.  See attached debugging
code, and subsequent patch/screenshot pairs.

test-fontset.el
Description: Text Data

Emacs 28, unpatched:

0-unpatched.png
Description: PNG image

"Vector" patch, with even worse results:

fontset-vector.patch
Description: Text Data

1-vector.png
Description: PNG image

"List" patch, with satisfactory results:

fontset-list.patch
Description: Text Data

2-list.png
Description: PNG image

Alternative "list" patch, with fewer mandatory codepoints and similarly
good results:

fontset-26.patch
Description: Text Data

3-list26.png
Description: PNG image

Should I submit (a variation of) one of these patches to bug-gnu-emacs?
Or should I look into other solutions?