make vars buffer-local beginning-of-defun-function

[Andreas Roehler]

FOR REVIEW

lisp.el

Suggest to make vars `beginning-of-defun-function',
`end-of-defun-function' buffer-local.

Should some mode set it globally by mistake, it will
take Emacs-Lisp beginning-of-defun with all the
other ones - i.e. the default then is unreachable.

To prevent this bug, setting it buffer-local
shouldn't be left to the mode, but should be done here.

Patch attached. IMHO it's not worth a changelog, as
`beginning-of-defun-function' is introduced fairly new,
no habits to change so far.

Should I commit?

Andreas

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