varidity of multibyte form.
(update_charset_table): Check validity of BYTES. Don't set
bytes_by_char_head here.
(init_charset_once): Set bytes_by_char_head completely.
(CHECK_BYTE_COMBINING_FOR_INSERT): Call byte_combining_error.
(insert_from_string_1): Set *(GPT_ADDR) to 0 before calling
CHECK_BYTE_COMBINING_FOR_INSERT.
(insert_from_buffer_1): Likewise.
(adjust_after_replace): Check the posibility of inhibitted byte
combining correctly.
(replace_range): Before signaling an error for inhibitted byte
combining, recover the buffer in a safe state.
(del_range_2): Check the posibility of inhibitted byte combining
correctly.
(syms_of_w32select): DEFVAR_LISP it.
(Fw32_set_clipboard_data): Use Vnext_selection_coding_system if
non-nil. Always convert multibyte strings.
(Fw32_get_clipboard_data): Use Vnext_selection_coding_system if
non-nil. Always convert a string that includes non-ASCII characters.
combined_before_bytes and combined_after_bytes into account.
(count_combining_after): Handle the case that LENGTH is zero.
(adjust_after_replace): Record deletion at correct buffer
position. Handle the case that LEN is zero.
(replace_range): Record deletion at correct buffer position.
(del_range_2): Call adjust_makers_for_replace to adjust makers for
combined bytes.
coding->spec.ccl.valid_codes for CCL based coding system.
(code_convert_region): Set point to FROM before inserting the
result of pre-write-funciton. Preserve original point.
(code_convert_string): If coding->type is coding_type_ccl, do
conversion even if the length of conversion region is zero.
Add ENCODE_BIG5 macro from coding.c.
(w32_no_unicode_output): New variable.
(w32_codepage_for_charset, w32_use_unicode_for_codepage): New
functions.
(BUILD_WCHAR_T, BYTE1, BYTE2): New macros.
(dumpglyphs): Rewrite based on xterm.c equivalent.
(x_new_font): Use functionality provided in fontset.c.
(x_new_fontset): New function based on the one in xterm.c.
(syms_of_w32term): Add w32-no-unicode-output flag.
(unibyte_display_via_language_environment): New global variable.
(x_set_font): Add support for setting fontsets.
(Fx_create_frame): Add check_w32(). Initialize fontsets. Fix
font names to match xlfd-tight-regexp.
(w32_load_font): Rewrite based on x_load_font.
(x_to_w32_charset, w32_to_x_charset): Add character sets. Use
`iso8859-1' rather than `ansi'.
(w32_to_x_font): Remove `-' from font name. Remove the `-' off the
end. Move charset into `charset registry' field.
(enum_font_cb2): Check charsets match. Include width in font list.
(w32_list_fonts): Rewrite based on x_list_fonts.
Moved from w32term.c to have access to enumfont_t struct.
(Fx_list_fonts): w32 specific version eliminated. Include
`x-list-fonts.c'.
(w32_get_font_info, w32_query_font, w32_find_ccl_program): New
functions for fontset support - adapted from x_ equivalents.
(syms_of_w32fns): New lisp variables initialised. Function
pointers for fontset.c set up.
