(Fsubstitute_in_file_name): Adjusted for the change of
CHAR_STRING. (Finsert_file_contents): Set Vlast_coding_system_used before calling signal_after_change. Call update_compositions if some texts are inserted.. (Fwrite_region): Adjusted for the change of a_write and e_write. (a_write): Argument changed. Work based on character position, not byte position. (e_write): Argument changed. Handle new way of composition.
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