bug#28412: 26.0.50; Let save-some-buffers accept write-contents-functions

[Kaushal Modi]

To close the loop:

A better fix (I confirm this iteration of the fix too -- fix for the ggtags issue[3]) for this was later applied in commit 3d3778d8[1]. See this emacs-devel thread[2] for discussion that arrived to this conclusion.

[1]: http://git.savannah.gnu.org/cgit/emacs.git/commit/?h=emacs-26&id=3d3778d82a87139ef50a24146f5bad2a57a82094

[2]: http://lists.gnu.org/archive/html/emacs-devel/2017-09/msg00858.html

[3]: https://github.com/leoliu/ggtags/issues/157

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Kaushal Modi