[NTG-context] How does lua callback work?

Sylvain Hubert champignoom at gmail.com
Wed Nov 4 20:06:28 CET 2020

On Wed, 4 Nov 2020 at 19:25, Hans Hagen <j.hagen at xs4all.nl> wrote:

> no callback
> \checkcharactersinfont
> will report missing chars
Thanks, but this command doesn't seem to add any information on top of the
missing characters that context already reported without the command.

My motivation was to write a module that suggests fallback fonts to the
user, ideally at the moment of encountering a missing character, but at the
end of processing is still acceptable.
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