New variables. (syms_of_fileio): DEFVAR_LISP them. (read_file_name_cleanup): New unwind function. (Fread_file_name_internal): Only return completions satifying Vread_file_name_predicate. Temporarily unwind protect and rebind default-directory while checking completions against the predicate. (Fread_file_name): Added PREDICATE argument. Specbind it to Vread_file_name_predicate during completion. Call Vread_file_name_function to read the file name if non-nil.
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