Eli Zaretskii <eliz@gnu.org> writes:
> So your problem is with Lisp programs that add functions to
> save-some-buffers-functions, but don't expect or don't want those
> functions to be called each time save-some-buffers is invoked?

Yes.

> I'm not sure how did those Lisp programs get the idea that
> save-some-buffers-functions will not be called always -- is it hinted
> by some documentation somewhere?  If not, I'd say that those Lisp
> programs have a bug that needs to be fixed in those programs.  Right?

I agree.

> In any case, not calling save-some-buffers-functions when PRED is
> non-nil is not something we can do, as that would be an incompatible
> behavior change.  We could perhaps add PRED to the arguments with
> which save-some-buffers-functions are called, as an optional argument.
> Would that be satisfactory?

Yes, that would solve the interference between Magit and hyperdrive.el.

See patch.

Thank you!

Joseph