Try to fix bug#5314. This is probably not the final word, tho.
* buffer.c (Fset_buffer_modified_p): Try and be careful not to modify recent-auto-save-p as a side-effect. * buffer.h (BUF_AUTOSAVE_MODIFF): New macro. * buffer.c (Fkill_buffer, reset_buffer): * editfns.c (Fsubst_char_in_region): * fileio.c (Finsert_file_contents, Fdo_auto_save) (Fset_buffer_auto_saved, Frecent_auto_save_p): Use it.
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