Bug#28412
* lisp/files.el (basic-save-buffer): Re-arrange function so that
write-contents-functions are run earlier. If they return non-nil,
consider the buffer saved without requiring the buffer to be
visiting a file.
(save-some-buffers): This function should consider any buffer with a
buffer-local value for write-contents-functions eligible for
saving.
* test/lisp/files-tests.el (files-test-no-file-write-contents): New
test.
* doc/lispref/files.texi (Saving Buffers): Mention in docs.
* etc/NEWS: And in NEWS.
9b980e2691