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to standing for nothing in lread.c (read_escape).

lm-header-multiline, lm-summary, lm-version, lm-commentary):
Return string without properties.
(lm-get-header, lm-get-package-name, lm-crack-address,
lm-insert-at-column, lm-report-bug): Minor doc fixes.

Use message_with_string.

(re_match_2_internal): Use PTR_BYTE_POS and PT_BYTE.

(Fx_store_cut_buffer_internal): Use size_byte.
(selection_data_to_lisp_data): Use make_multibyte_string.

(x_set_name, x_set_title, validate_x_resource_name): Likewise.
(Fx_get_resource, display_x_get_resource): Likewise.
(x_get_resource_string): Likewise.

Callers changed.
(message1, message1_nolog): String must be ASCII-only.
(message2, message2_nolog): Now static.
(x_consider_frame_title): Use size_byte.
(display_text_line): Likewise.
And scan Voverlay_arrow_string by bytes and chars.
(display_menu_bar): Call display_string with a byte size.
(display_mode_line): Call display_string with a byte size.

(Fset_window_configuration): Set old selected window's pointm.

for either kind of buffer.  Scan string by bytes and chars.

(struct lisp_String): New field size_byte.

(describe_vector): Pass new args to insert_from_string.
(Ftext_char_description): Use make_multibyte_string.
(Fkey_binding): Scan PREFIX a char at a time.
(Fkey_description): Scan KEYS by chars.

(Fexecute_extended_command): Likewise.
(read_char_minibuf_menu_prompt): Use message2_nolog, not message1.
(parse_modifiers): Use size_byte.
(echo_char): Use size_byte.
(parse_modifiers_uncached): Likewise.
(record_char): Likewise.
(parse_solitary_modifier): Likewise.
(read_char): Use Faref on Vkeyboard_translate_table
if it is a string.
(apply_modifiers_uncached): New arg base_len_byte.  Calls changed.
(read_char_minibuf_menu_prompt):
(read_key_sequence): Access buffer's downcase_table with XCHAR_TABLE.
(Fexecute_extended_command): Use Faref to access FUNCTION.
Use size_byte of BINDING.
(stuff_buffered_input): Use size_byte of STUFFSTRING.

(Fwrite_region): Use message_with_string.
(auto_save_error, Fdo_auto_save): Likewise.
(Ffile_name_directory): Maybe use make_unibyte_string.
(Ffile_name_nondirectory): Likewise.
(Fsubstitute_in_file_name): Convert substituted envvars to multibyte
if necessary.  Otherwise use make_unibyte_string.
(Finsert_file_contents): Use make_unibyte_string.
(double_dollars): Use make_uninit_multibyte_string.

(Fsubstitute_command_keys): Scan by bytes.

(Faref): Index string by chars.
(Faset): Index multibyte string by chars.

avoid testing enable-multibyte-characters.
(internal_self_insert): Use make_multibyte_string.

(Fstring): Use make_multibyte_string.
(Fcompose_string): Likewise.
(Ffind_charset_string): Handle bytes vs chars in string.
Special case for single-byte strings.
(Fchars_in_string): Function deleted.
(Fstring): Renamed from Fconcat_chars.
Handle bytes vs chars in string.
(syms_of_charset): Corresponding changes.

(describe_category): Pass new args to insert_from_string.
(describe_category_1): Likewise.

Use make_multibyte_string.

(oblookup): Take args SIZE and SIZE_BYTE.  Callers changed.
(init_obarray, read1, make_symbol):
Pass new arg to make_pure_string.
(Fintern, oblookup, Fintern_soft, intern): Handle size_byte.
(dir_warning): Pass new arg to message_dolog.
(read1): PCH is now int *.
Declare ch as int.
(read0): Declare c as int.
(read_list): Declare ch as int.
(read0): Use Fmake_string not make_string.
(read1): When reading a string, maybe use make_unibyte_string.
(Fread_from_string): Convert string indices to/from bytes.

(insert_from_string_1, insert_from_buffer_1): Use it.
(copy_text): New function.
(insert_from_buffer_1): Call copy_text to convert between
single-byte and multibyte text.
(insert_from_string_1): Likewise.
(insert_1_both): New function.
(insert_from_string): New args POS_BYTE, LENGTH.
(insert_from_string_before_markers):
(insert_from_string_1): New arg POS_BYTE.  Swap args NCHARS, NBYTES.
Don't fail to use POS_BYTE!
(insert_from_buffer_1): Get both inschars and insbytes from NEW.

(Fsubstring): Use make_multibyte_string.
(concat, Fsubstring, internal_equal, mapcar1):
Distinguish bytes and chars when indexing strings.
(Fstring_equal, Fstring_lessp): Likewise.
(substring_both): New function.
(string_make_multibyte, string_make_unibyte): New functions.
(string_char_to_byte, string_byte_to_char): New functions.

Calculate the right size the first time, so no need to retry.
Count chars and bytes in the result.
Convert single-byte strings to multibyte as needed.

(dabbrev--find-expansion): Ignore those buffers
unless they get specifically preferred.

You can now `quote' symbols that look like keystrokes
When spell checking, meta variables can end in `th' or `s'.