Eli Zaretskii <eliz@gnu.org> writes:

> Could the code which writes the file do it in atomic fashion,
> i.e. write a temporary file, then rename the original file, then move
> the new to the original's name, then delete the original file?
>
> (On Posix filesystems moving a file to the original name is an atomic
> operation, but not on MS-Windows, which is why I suggest a slightly
> more complicated procedure.)

See the attached diff.
It should be applied on top of previous patches (or on top of the latest
Org main).