If I understand things correctly, the problem would go away, if
require-f-n would just add the newline when writing the file but not
to the buffer (a bit similar to a function in
`write-region-annotate-functions') . Then the user would only come to
see it, if she reverts the buffer; in this case it is longlines.el's
job to use its heuristics to detect whether the final newline is hard
or soft.
That is an interesting suggestion, but I tend to suspect it
might also cause problems. People could try it and see.
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