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Positions might change if the length of one dired header line
changes; this happen, for instance, if we add new files.
Instead, line numbers are invariant under shrinks/enlargements
of the file header.
https://lists.gnu.org/archive/html/emacs-devel/2017-07/msg01092.html
* lisp/dired.el (dired-save-positions): Save the line numbers at point.
(dired-restore-positions): Use forward-line to restore the original
position (Bug#27968).
* test/lisp/dired-tests.el (dired-test-bug27968): Add test.

Respect comment-auto-fill-only-comments when auto-filling and a
comment syntax is defined.

* lisp/newcomment.el (comment-indent-new-line): Do not check
comment-auto-fill-only-comments.
* lisp/simple.el (internal-auto-fill): New defun.
* src/cmds.c (internal_self_insert): Call Qinternal_auto_fill, not
auto_fill_function.
(syms_of_cmds): Define Qinternal_auto_fill.

* lisp/international/mule-conf.el: Redo unification of
cns11643-15.  (Bug#27964)
(chinese-cns11643-15): Add the missing :unify-map attribute.

* lisp/international/mule-conf.el: Undo unification of
cns11643-15, as that causes segfaults during bootstrap.
(Bug#27964)

* lisp/ruler-mode.el (ruler-mode-ruler, ruler-mode-window-col):
* lisp/emacs-lisp/tabulated-list.el (tabulated-list-init-header)
(tabulated-list-print-entry): Account for the width taken by
line-number display.  (Bug#27895)

* src/buffer.c (Fgenerate_new_buffer_name): Test IGNORE for being
nil before calling string-equal, since the latter will compare
"nil and 'nil' as equal.  (Bug#27966)

* test/src/buffer-tests.el
(test-generate-new-buffer-name-bug27966): New test.

* lisp/international/mule-conf.el (chinese-cns11643-15): Add a
unify-charset form for it.  (Bug#27964)

* lisp/term/x-win.el (x-win-suspend-error):
* lisp/term/ns-win.el (ns-suspend-error): Improve the error
message.  (Bug#27901)

* lisp/faces.el (describe-face): Return (buffer-string).  Reorder
the placement of variables/faces in describe-symbol, to put more
emphasis on the variable entry rather than the face.  (Bug#24543)

* test/lisp/files-tests.el
(files-tests--file-name-non-special--subprocess): Fix this test
for MS-Windows.

* lisp/simple.el (region-extract-function): Rename the argument to
METHOD.  Doc fix.  (Bug#27927)

This incorporates:
2017-08-04 manywarnings: port to 64-bit GCC builds of Emacs
2017-08-01 manywarnings: port to 32-bit GCC bug
* lib/gnulib.mk.in: Regenerate.
* m4/manywarnings.m4: Copy from gnulib.

* src/sysdep.c (renameat_noreplace) [!RENAME_NOREPLACE]:
Don’t use syscall.  Problem reported by Tino Calancha (Bug#27946#10).

This function must return non-nil for a wildcard like '/*/*.txt'.
* lisp/files.el (insert-directory-wildcard-in-dir-p): Adjust regexp.
* test/lisp/files-tests.el (files-tests--insert-directory-wildcard-in-dir-p):
Add test.

* test/lisp/emacs-lisp/map-tests.el (test-map-elt-testfn)
(test-map-put-testfn-alist): Make sure the lookup key is really non-eq
to the map's key, even if the code is compiled.

* lisp/emacs-lisp/avl-tree.el (avl-tree-iter): New iter-defun.

Use 'file-expand-wildcards' instead of 'eshell-extended-glob' to
expand the wildcards.
Suggested by Fabrice Popineau in:
https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00108.html
* lisp/ls-lisp.el (ls-lisp--dired): Use file-expand-wildcards.

* lisp/info.el (Info-default-directory-list): Describe in the
commentary when it is initialized.  (Bug#27933)

Skip the test if Dired use 'ls' emulation with lisp.  The same
bug is tested in their respective test suites: ls-lisp-tests.el
and em-ls-tests.el.
* test/lisp/dired-tests.el (dired-test-bug27631): Skip test if 'ls-lisp'
or 'eshell' features are enabled.

* test/lisp/dired-tests.el (dired-test-bug25609): On MS-Windows,
pass temporary files through file-truename, to avoid bogus
failures due to file-name comparison as strings.

https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00018.html
* test/lisp/vc/ediff-ptch-tests.el (ediff-ptch-test-bug26084):
Add comments to explain the test logic.
Pass '--binary' option to 'patch' program in windows environments.
Check explicitely that a backup is created before compare file contents.

* test/lisp/dired-tests.el (dired-test-bug25609):
Declare variable 'dired-dwim-target' right before the test.
Add comments to explain the test logic.
Ensure, before test the bug condition, that we are displaying the
2 dired buffers created in this test, and no other dired buffer
is shown.

* lisp/files.el (insert-directory): Don't hardcode "-c".
* lisp/term.el (term, ansi-term): Use shell-file-name.

Problem reported by Glenn Morris (Bug#27708#58).
* src/gnutls.c (HAVE_GNUTLS_X509_SYSTEM_TRUST):
New macro.  Use it instead of low-level version number checks.
(HAVE_GNUTLS_AEAD): Move here from gnutls.h, and rename from
HAVE_GNUTLS3_AEAD.  All uses changed.  Indent preprocessor lines.
* src/gnutls.h (HAVE_GNUTLS3_CIPHER, HAVE_GNUTLS3_DIGEST)
(HAVE_GNUTLS3_HMAC): Remove, since these were available
before GnuTLS 3.0.0 and the code checks them only if HAVE_GNUTLS3
is defined.  Remove all uses; this simplifies the code a bit.

Problem reported by Ted Zlatanov in:
http://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00082.html
* src/fileio.c (Frename_file): On RHEL 7 + NFS, renameat2 can fail
with errno == EINVAL when it is not supported.  So treat that case
like errno == ENOSYS.  Also, when ok_if_already_exists is neither
nil nor an integer, just call plain rename; this avoids an extra
syscall to renameat2 when the latter fails with errno == EINVAL or
ENOSYS or ENOENT.

* src/gnutls.h (HAVE_GNUTLS3_AEAD): Define only if GnuTLS 3.5.1 or
later, as opposed to the old 3.4.0 or later.

There's only one GnuTLS, so configuring these symbols at
'configure' time is overkill.  Simplify things by moving their
configuration to src/gnutls.h (Bug#27708).
* configure.ac (HAVE_GNUTLS3, HAVE_GNUTLS3_HMAC, HAVE_GNUTLS3_AEAD)
(HAVE_GNUTLS3_CIPHER, HAVE_GNUTLS3_DIGEST): Move these definitions
from here ...
* src/gnutls.h: ... to here, and simplify.

* configure.ac (with_mailutils): Default to 'yes' if GNU Mailutils
is installed.  See:
http://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00054.html

* Makefile.in (configure, bootstrap): Run ‘./autogen.sh autoconf’,
not plain ‘./autogen.sh’, to make it clear that only
autoconf-related tools should be run here.

* test/lisp/dired-tests.el (dired-test-bug27243-01): Log
positions saved and restored by dired-revert to try and find
out why the test fails on Hydra.

* lisp/ls-lisp.el (eshell-extended-glob): autoload call instead of cookie.

* src/fileio.c (Frename_file): Avoid calling Ffile_directory_p
more than once on FILE.  Use renameat_noreplace, so that we can
ask the user (and unlink and retry) only if this fails with errno
== EEXIST or ENOSYS.  This avoids the need to ask the user for
permission to do an operation that will fail anyway.  Simplify
computation of ok_if_already_exists for subsidiary functions.
* src/filelock.c (rename_lock_file): Prefer renameat_noreplace
if it works, as this avoids the need to link and unlink.
* src/lisp.h (renameat_noreplace): New decl.
* src/sysdep.c [HAVE_LINUX_FS_H]: Include linux/fs.h and sys/syscall.h.
(renameat_noreplace): New function.

* src/fileio.c (Fadd_name_to_file, Fmake_symbolic_link):
Ask the user (and unlink and retry) only if link creation fails
with errno == EEXIST.  This avoids the need to ask the user for
permission to do an operation that will fail anyway.

* lisp/dired.el (dired-align-file): Inherit text
properties in inserted spaces (Bug#27899).
* test/lisp/dired-tests.el (dired-test-bug27899): Add test.

* lisp/dired.el (dired-insert-directory): Use executable-find in
a local host.

Suggested in:
https://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00018.html
* test/lisp/dired-tests.el (dired-test-bug27693)
(dired-test-bug27762, dired-test-bug27817)
(dired-test-bug27631, dired-test-bug27843): Delete those
parts requiring either ls-lisp or eshell-ls.

* test/lisp/ls-lisp-tests.el (ls-lisp-test-bug27762)
(ls-lisp-test-bug27631, ls-lisp-test-bug27693):
Add all dired tests using ls-lisp here.

* test/lisp/eshell/em-ls-tests.el (em-ls-test-bug27631)
(em-ls-test-bug27817, em-ls-test-bug27843): New test file.  Add
all dired tests using eshell-ls here.