bug#58992: 28.2; "lax space matching" no longer works

[Gregory Heytings]

> I tested with "emacs -Q", and I've just tested again. I confirm the 
> behavior I could see: a newline character is matched.  That's Debian's 
> package emacs-gtk 1:27.1+1-3.1+b1.

Are you really sure?  I just tested this with that same version of Emacs 
(Debian package emacs-gtk 1:27.1+1-3.1+b1), and

emacs -Q
ab RET bc RET ab SPC cd
M-<
C-s b SPC c

only matches the third line.