commit 74d091a0a665da5dc01989d1b06a61ee21b975b2
Author: Lars Ingebrigtsen <larsi@gnus.org>
Date: Fri Sep 10 12:27:28 2021 +0200
Change the default value of search-whitespace-regexp
* lisp/isearch.el (search-whitespace-regexp): Change the default
to always exclude newlines from the set (bug#21278). It used to
be mode-dependent whether newlines were included or not, and this
was confusing as a user interface.
which changed the default value of search-whitespace-regexp from
"\\s-+" to "[ \t]".
This is still buggy in Emacs 28.2 if I change the value:
This works in Fundamental mode, but not in Lisp mode.