I find the <Enter> key is recognized differently before and after
evaluating

  (set-keyboard-coding-system 'utf-8)

in today's updated version of Emacs.  Before evaluating that, it is
recognized as RET; after that, it is then recognized as C-j.
Evaluating

  (set-keyboard-coding-system nil)

is one way to make <Enter> be recognized as RET again.

This change breaks several modes' behaviors.  How to avoid such
things happenning?  Thanks.

Regards,
Guanpeng Xu
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