(char_quoted): Use FETCH_CHAR_AS_MULTIBYTE to convert
unibyte chars to multibyte. (back_comment): Likewise. (scan_words): Likewise. (skip_chars): The arg syntaxp is deleted, and the code for handling syntaxes is moved to skip_syntaxes. Callers changed. Fix the case that the multibyteness of STRING and the current buffer doesn't match. (skip_syntaxes): New function. (SYNTAX_WITH_MULTIBYTE_CHECK): Check C by ASCII_CHAR_P, not by SINGLE_BYTE_CHAR_P. (Fforward_comment): Use FETCH_CHAR_AS_MULTIBYTE to convert unibyte chars to multibyte. (scan_lists): Likewise. (Fbackward_prefix_chars): Likewise. (scan_sexps_forward): Likewise.
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