bug#56476: 29.0.50; lisp-fill-paragraph broken

[Visuwesh]

lisp-fill-paragraph does not fill paragraphs properly anymore.  It
leaves a space in the beginning of line, it does not join soft newlines.

To reproduce, paste the following text in emacs -Q

    (defvar test
      "Some docstring.
    This buffer is for text that is not saved, and for Lisp evaluation.
    To create a file, visit it with C-x C-f and enter text in its buffer.")

and move the point inside the docstring and say M-x lisp-fill-paragraph
RET.  Now undo the changes, and say M-q which fills the docstring
properly.

Reverting the last three commits that touched lisp-fill-paragraph fixes
the issue for me.

    commit 8f5d9d0abd0f5078646bc85c7a4d480b32057a47
    Author: Lars Ingebrigtsen <larsi@gnus.org>
    Date:   Sun Jun 26 16:31:33 2022 +0200

        Fix a recent Lisp mode filling test failure

        * lisp/emacs-lisp/lisp-mode.el (lisp-fill-paragraph): Restore the
        "fill first line separately" logic.

    commit 040c03cae2db361d2e014a52d969a6b0ebc48f1c
    Author: Lars Ingebrigtsen <larsi@gnus.org>
    Date:   Sat Jun 25 14:58:01 2022 +0200

        Make `M-q' work on the first line of a multi-line string again

        * lisp/emacs-lisp/lisp-mode.el (lisp-fill-paragraph): Exclude the
        quote marks from the region so that filling works (bug#56197).

    commit 88a04ea985180d1fd619c4a6540fb117a1d59d9e
    Author: Lars Ingebrigtsen <larsi@gnus.org>
    Date:   Wed Apr 13 05:07:30 2022 +0200

        Tweak how `M-q' in emacs-lisp-mode works

        * lisp/emacs-lisp/lisp-mode.el (lisp-fill-paragraph): Only fill as
        strings inside strings (bug#31656).
        (lisp--fill-line-simple): New function to do simple sexp-based
        filling.


In GNU Emacs 29.0.50 (build 2, x86_64-pc-linux-gnu, X toolkit, Xaw scroll bars)
 of 2022-07-10 built on astatine
Repository revision: 85a06306c0e2ca27365cf213b26ed526ae7a0b76
Repository branch: tamil-phonetic4
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Debian GNU/Linux 11 (bullseye)

Configured using:
 'configure --with-sound=alsa --with-x-toolkit=lucid --with-json
 --without-xaw3d --without-gconf --without-libsystemd --without-cairo'

Configured features:
ACL DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XFT
XIM XINPUT2 XPM LUCID ZLIB

Important settings:
  value of $LC_MONETARY: ta_IN.UTF-8
  value of $LC_NUMERIC: ta_IN.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Shell

Minor modes in effect:
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  recentf-mode: t
  eros-mode: t
  pdf-occur-global-minor-mode: t
  minibuffer-depth-indicate-mode: t
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  display-time-mode: t
  display-battery-mode: t
  winner-mode: t
  delete-selection-mode: t
  straight-use-package-mode: t
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  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  undelete-frame-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
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dynamic-setting system-font-setting font-render-setting x-toolkit
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Memory information:
((conses 16 1038014 190846) (symbols ?0 48207 339) (strings 32 262637 22687) 
(string-bytes 1 7127398) (vectors 16 119592) (vector-slots 8 2674512 186555) 
(floats 8 673 924) (intervals ?8 76450 5808) (buffers 992 ?U))