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hunting.
(struct sdata) [GC_CHECK_STRING_BYTES]: Always record the string's
size in the sdata structure.
(SDATA_NBYTES, SDATA_DATA): New macros.
(SDATA_OF_STRING, SDATA_SIZE) [GC_CHECK_STRING_BYTES]: Define
differently for the different layout of the sdata structure.
(allocate_string_data) [GC_CHECK_STRING_BYTES]: Record string size
in sdata.
(sweep_strings, compact_small_strings) [GC_CHECK_STRING_BYTES]:
Check that size recorded in the string size and size recorded in
the sdata structure agree.

(__malloc_size_t) [!DOUG_LEA_MALLOC]: Define unconditionally as
size_t.
(__malloc_extra_blocks): Declare as __malloc_size_t.

[!HAVE_STDLIB_H]: Declare malloc.

current-load-list in top-level forms.  Else this leaks a cons cell
every time a defun is called.

(auto-insert-alist): Following GNU notices, don't say `copyright
_by_'.  Use line-beginning-position.
(auto-insert): Check buffer-file-name is non-nil before use.

(read_char): If help-echo is showing, preserve the echo area
when redisplaying.

(set_message): Reset it to 0.
(init_xdisp): Initialize help_echo_showing_p.

starting with `@def' or `@multitable', in addition to ones
specified by the user in auto-fill-inhibit-regexp.

rmail-dont-reply-to-names matches the empty string.

text to sound more friendly.

Generally, sync w/ maintainer version 5.22.

(hs-hide-all-non-comment-function): New var.
(hs-hide-hook, hs-show-hook, hs-minor-mode): Update docstrings.
(hs-hide-all): Use `hs-hide-all-non-comment-function'.
(hs-show-region): Delete this command.
(hs-minor-mode-map): Change bindings to leave "C-c LETTER" alone.

for the case window has a header-line.