Hi all!

I'm trying to figure out how to get the language-settings for the current 
DrRacket editor, for use in an existing plugin.
My first attempt seemed to work for some time, but I've finally tracked down a 
bug with it; my new attempt seems to fix the bug, but I thought I'd try harder 
to get feedback.*

I'm now trying

(send (send a-drracket:unit:frame get-definitions-text) get-next-settings)

and getting a-drracket:unit:frame can be done through 
drracket:get/extend:extend-unit-frame (as already done by the plugin I'm 
modifying). This seems to work, but is it actually correct?

*If you wonder, my goal is actually fixing 
https://github.com/racket/handin/issues/17, and I already started in 
https://github.com/racket/handin/pull/22; I didn't mention that until now 
because there are more people familiar with DrRacket than with the handin 
server. The lack of people also explains why I'm attempting this fix without 
the necessary mastery.

Should you want to see the fix in context, see
https://github.com/racket/handin/commit/1348760243d9b989acb8a71d8a6f7a8f82652960

Cheers,
Paolo

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