Subject: bug#70212: Customize Group buffer: add button to reveal underlying variable names

From: Dan Jacobson <[email-masked]>
Date: Fri, 05 Apr 2024 16:45:48 +0800

The user is in buffer
*Customize Group: Compilation* 

The user sees:
Show Value Compilation Max Output Line Length 
   Output lines that are longer than this value will be hidden. Hide
   If nil, don’t hide anything.

Try as the user might, there is no way for him to discover the
underlying variable there in the interface.

All he can do is do C-h v and start guessing its name. Finally arriving at

(describe-variable 'compilation-max-output-line-length)