bug#34805: 25.2; smie-indent-fixindent wrong if comment-start-skip has alternatives

[Andrey Bondarenko]

If comment-start-skip contains alternatives smie-indent-fixindent will
construct wrong regexp that appends "fixindent" only to last alternative
and match all other aletrnatives as is.

For example: 

(let ((comment-start-skip "#+\\s *\\|//+\\s *")
      (comment-end-skip ""))
 (concat comment-start-skip
         "fixindent" 
         comment-end-skip)) → "#+\\s *\\|//+\\s *fixindent"

This regexp would match "// fixindent" comments and any comment
that starts with "#", which is wrong. 

I think it should enclose comment-start-skip and comment-end-skip in \\(
\\) to work correctly. Something like:

(let ((comment-start-skip "#+\\s *\\|//+\\s *")
      (comment-end-skip ""))
 (concat "\\(" comment-start-skip "\\)"
         "fixindent" 
         "\\(" comment-end-skip "\\)")) → "\\(#+\\s *\\|//+\\s 
*\\)fixindent\\(\\)"




In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
 of 2017-09-23, modified by Debian built on lgw01-amd64-050
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:     Ubuntu 18.04.2 LTS

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --build x86_64-linux-gnu
 --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
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-fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: ru_RU.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Prog

Minor modes in effect:
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  recentf-mode: t
  delete-selection-mode: t
  ergoemacs-mode: t
  global-undo-tree-mode: t
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  global-ethan-wspace-mode: t
  show-paren-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
24 matches
Mark set [2 times]
2 matches
Mark set
2 matches [9 times]
24 matches
200 matches (limit reached)
Mark set
18 matches
ergoemacs-command-loop--grow-interactive: End of buffer [3 times]

Load-path shadows:
/usr/share/emacs/25.2/site-lisp/debian-startup hides 
/usr/share/emacs/site-lisp/debian-startup

Features:
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Memory information:
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 (symbols 48 48364 1)
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 (strings 32 124966 14441)
 (string-bytes 1 3094860)
 (vectors 16 59098)
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