(Fgarbage_collect): Clear out buffer undo_list markers after gc_sweep.
Identify those markers as Lisp_Misc_Free objects. Clear car and cdr of
the removed cons cells.
(mark_object): Undo previous change - disallow Lisp_Misc_Free objects.
(gc_sweep): Clear cons_blocks before sweeping strings, so we don't have
any cons cells pointing to unallocated stings.
Do not lisp_free any marker blocks, as there may still be pointers
to them from buffer undo lists at this stage of GC.
docstring these arguments meant for internal (recursive) use only.
(allout-char-spec): Comment out (it's not implemented).
(allout-old-expose-topic, allout-exposure): Fix docstring and add obsolescence
declaration.
(allout-flatten-exposed-to-buffer, allout-indented-exposed-to-buffer): Fix typos
in docstring.
(my-mark-marker): Doc fix.
(produce-allout-mode-map, allout-sibling-index, allout-isearch-expose)
(allout-distinctive-bullet, allout-open-topic, allout-reindent-body)
(allout-rebullet-heading, allout-process-exposed, allout-insert-listified)
(allout-latex-verb-quote, allout-insert-latex-header)
(allout-insert-latex-trailer): Make arguments match their use in
docstring.
(allout-primary-bullet, allout-old-style-prefixes, allout-inhibit-protection)
(allout-init, allout-mode, allout-before-change-protect, allout-flag-region):
Use "Emacs" instead of "emacs" in docstrings.
`inhibit-read-only' binding. Make sure that `inhibit-read-only'
is, by default, nil during the execution of
`find-file-not-found-functions' and `find-file-hook'.
(completion-setup-function): Use with-current-buffer.
Properly save excursion. Simplify.
Don't assume there is necessarily a `mouse-face' property somewhere.
beginning and ends of symbols.
* regex.c (enum syntaxcode): Add Ssymbol.
(init_syntax_once): Set the syntax for '_' to Ssymbol, not Sword.
(re_opcode_t): New opcodes `symbeg' and `symend'.
(print_partial_compiled_pattern): Print the new opcodes properly.
(regex_compile): Parse the new operators.
(analyse_first): Skip symbeg and symend (they match only the empty string).
(mutually_exclusive_p): `symend' is mutually exclusive with \s_ and
\sw; `symbeg' is mutually exclusive with \S_ and \Sw.
(re_match_2_internal): Match symbeg and symend.
