* lisp/auth-source-pass.el: Update version to 4.0.1

Test checking that auth-source-pass backend is correctly installed

* test/lisp/auth-source-pass-tests.el
(auth-source-pass-can-start-from-auth-source-search): Add test.

Make sure auth-source-pass is compatible with Emacs 25

* lisp/auth-source-pass.el: Use `advice-add' for Emacs 25 users as
`auth-source-backend-parser-functions' does not exist there.

* lisp/auth-source-pass.el: Update version to 4.0.0

Fix prefix messages of auth-source-pass debug messages

* lisp/auth-source-pass.el (auth-source-pass--do-debug): Fix message
prefix.

* lisp/auth-source-pass.el: Update version to 3.0.0

Silence byte compiler warning in auth-source-pass

* lisp/auth-source-pass.el (auth-source-pass-backend): Silence byte
compiler warning by only passing a parameter to `auth-source-backend'
in Emacs <= 25.

Fix auth-source-pass.el to properly handle special inputs

* lisp/auth-source-pass.el (auth-source-pass-search): Warn when
passing multiple hosts in SPEC. Early return and warn when passing a
wildcard as host in SPEC. Early return when host is nil.
* test/lisp/auth-source-pass-tests.el (auth-source-pass-any-host,
auth-source-pass-undefined-host): Add corresponding tests.

auth-source-pass: Take care of matching hosts when port is provided

* lisp/auth-source-pass.el (auth-source-pass--find-match): Add PORT
parameter and reorganize code by extracting `find-match-unambiguous'.
(auth-source-pass--find-match-unambiguous): New function.
(auth-source-pass--build-result): Fix the call to `find-match'.
(auth-source-pass--hostname, auth-source-pass--hostname-with-user,
auth-source-pass--user): Remove functions.
* test/lisp/auth-source-pass-tests.el: Fix the calls to `find-match'.
(auth-source-pass-find-host-without-port) Add corresponding test.

Add missing test cases to auth-source-pass-tests.el

* test/lisp/auth-source-pass-tests.el
(auth-source-pass-build-result-passes-full-host-to-find-match): Add
missing test cases.

Add a test to auth-source-pass-tests.el

* test/lisp/auth-source-pass-tests.el
(auth-source-pass-build-result-passes-full-host-to-find-match): Add
test making sure find-match is called with full host.

Fix indentation in auth-source-pass-tests.el

* test/lisp/auth-source-pass-tests.el
(auth-source-pass-only-return-entries-that-can-be-open): Fix indentation.

* test/lisp/auth-source-pass-tests.el: Add assertions for host:port

* lisp/auth-source-pass.el: Fix headers.

Fix selinux test in files-tests.el

* test/lisp/files-tests.el
(files-tests-file-name-non-special-set-file-selinux-context):
Adapt test.

; Merge from origin/emacs-26

The following commit was skipped:

5d448ca (origin/emacs-26) Make cl-print respect print-level and print...

Merge from origin/emacs-26

03697e6 Fix remote-host directory tracking for shells in `term' buffers
16e8541 Update doc string of 'rx'

; Merge from origin/emacs-26

The following commits were skipped:

9a14b4d ; Merge: backports from master
ed962f2 Fix bug#30846, along with misc cleanups found along the way
3ba5fc2 esh-opt.el: Fix improper parsing of first argument (Bug#28323)
0ac98cc * lisp/epa.el (epa-decrypt-file): Apply epa-pinentry-mode (Bu...
9552485 Fix cl-print for circular sublists (Bug#31146)
4c6cdf6 Revert "Make mail-extract-address-components return the user ...
51ee8bc Centralize Bug#30931 fix
daa6023 Fix another case of freed markers in the undo-list (Bug#30931)
7460840 Fix CHECK_ALLOCATED_AND_LIVE abort during GC
71192e0 Don't wait for visible frames to become visible
5fa73a7 query-replace undo: Handle when user edits the replacement st...
031004e Backport: Fix corner case in query-replace-regexp undo
50c0624 Backport: Preserve case in query-replace undo

Merge from origin/emacs-26

defd53a Set accessibility subroles for child frame (bug#31324)
de6a876 Fix redefinition of child frames on NS

Fix Bug#31489

* lisp/files.el (file-name-unquote-non-special): Remove.
(file-name-quoted-p, file-name-quote, file-name-unquote):
Add optional argument TOP.
(file-name-non-special): Adapt callees.  Finish implementation of
functions which need a local copy.  (Bug#31489)

Make cl-print respect print-level and print-length (bug#31559)

* lisp/emacs-lisp/cl-print.el (cl-print--depth): New variable.
(cl-print-object) <cons>: Print ellipsis if printing depth greater
than 'print-level' or length of list greater than 'print-length'.
(cl-print-object) <vector>: Truncate printing with ellipsis if
vector is longer than 'print-length'.
(cl-print-object) <cl-structure-object>: Truncate printing with
ellipsis if structure has more slots than 'print-length'.
(cl-print-object) <:around>: Bind 'cl-print--depth'.
* test/lisp/emacs-lisp/cl-print-tests.el
(cl-print-tests-3, cl-print-tests-4): New tests.

(cherry picked from commit 0f48d18fd2a30f29cc3592a835d2a2254c9b0afb)

Add proper Flymake support to cc-mode.el

Except for the important detail that it doesn't make temporary files,
the new flymake-cc backend doesn't yet behave much differently from
the old flymake-proc-legacy-flymake, i.e. it still needs a special
`check-syntax' Makefile target to provide the compiler and compilation
flags.  However, the new infrastructure created should allow less
intrusive cleverer flag guessers (yet to be written) to replace that
mechanism.

* lisp/progmodes/cc-mode.el (c-mode, c++-mode): Add to
flymake-diagnostic-functions.

* lisp/progmodes/flymake-cc.el: New file.

Fix remote-host directory tracking for shells in `term' buffers

* lisp/term.el (term-handle-ansi-terminal-messages): Use an explicit
tramp method when constructing the tramp path for a non-local host,
as this is now mandatory.  "-" is a pseudo-method for the user's
`tramp-default-method'.  (Bug#31355)

Specify the remote username explicitly in all cases, as
`tramp-default-user' and `tramp-default-user-alist' could cause the
previous logic to fail.

Minor related improvements to the commentary.

Add NS style text scale keybindings

* lisp/term/ns-win.el: Add super-based keybindings for adjusting text
zoom.

Update doc string of 'rx'

* lisp/emacs-lisp/rx.el (rx): Update the description of some
character classes.

; Merge: backports from master

Fix bug#30846, along with misc cleanups found along the way

* test/src/data-tests.el (data-tests-kill-all-local-variables): New test.

* src/buffer.c (swap_out_buffer_local_variables): Remove.
Fuse the body of its loop into that of reset_buffer_local_variables.
(Fkill_buffer, Fkill_all_local_variables): Don't call it any more.
(reset_buffer_local_variables): Make sure the buffer's local binding
is swapped out before removing it from the alist (bug#30846).
Call watchers before actually killing the var.

* src/data.c (Fmake_local_variable): Simplify.
Use swap_in_global_binding to swap out any local binding, instead of
a mix of find_symbol_value followed by messing with where&found.
Don't call swap_in_symval_forwarding since the currently swapped
binding is never one we've modified.
(Fkill_local_variable): Use swap_in_global_binding rather than messing
with where&found to try and trick find_symbol_value into doing the same.

* src/alloc.c (mark_localized_symbol): 'where' can't be a frame any more.

(cherry picked from commit 3ddff080341580eb6fc18d907181e9cc2301f62d)

esh-opt.el: Fix improper parsing of first argument (Bug#28323)

Examples of broken behavior:

    sudo -u root whoami
    Outputs: -u
    ls -I '*.txt' /dev/null
    Errors with: *.txt: No such file or directory

* lisp/eshell/esh-opt.el (eshell--process-args): Refactor usage of
args to eshell--args, as we rely on modifications from
eshell--process-option and vice versa.  These modifications were not
being propogated in the (if (= ai 0)) case, since popping the first
element of a list doesn't destructively modify the underlying list
object.

(cherry picked from commit 92a8230e49a65be48442ee95cf50c90514e48f99)

* lisp/epa.el (epa-decrypt-file): Apply epa-pinentry-mode (Bug#30363).

(cherry picked from commit 217202c084232f36d4fa0fead0f3aca21396d074)

Fix cl-print for circular sublists (Bug#31146)

* lisp/emacs-lisp/cl-print.el (cl-print-object) <cons>: Push each
element of list being printed onto cl-print--currently-printing.
* test/lisp/emacs-lisp/cl-print-tests.el (cl-print-circle-2): New
test.

(cherry picked from commit b8aa7ecf54c9b164a59f1b0e9f9fe90531dadd20)

Revert "Make mail-extract-address-components return the user name more"

This reverts commit 8b50ae8b2284b5652c2843a9d0d076f4f657be28.

According to tests in bug#27656 by OGAWA Hirofumi, this patch
led to wrong results when binding

(dolist (addr '("Rasmus <rasmus@gmx.us>" "Rasmus <mbox@gmx.us>"))
  (dolist (ignore-single '(t nil))
    (dolist (ignore-same '(t nil))
      (let ((mail-extr-ignore-single-names ignore-single)
    (mail-extr-ignore-realname-equals-mailbox-name ignore-same))
(message "%s" (mail-extract-address-components addr))))))

in combination.

(cherry picked from commit a3a9d5434d56f8736cc47e379a1d011d4c779b7c)

Centralize Bug#30931 fix

* src/marker.c (detach_marker): New function.
* src/editfns.c (save_restriction_restore):
* src/insdel.c (signal_before_change): Use it.

(cherry picked from commit 6f66a43d7ad6cada2b7dbb6d07efe36be1dc7ecb)

Fix another case of freed markers in the undo-list (Bug#30931)

* src/alloc.c (free_marker): Remove.
* src/editfns.c (save_restriction_restore):
* src/insdel.c (signal_before_change): Detach the markers from the
buffer when we're done with them instead of calling free_marker on
them.
* test/src/editfns-tests.el (delete-region-undo-markers-1)
(delete-region-undo-markers-2): New tests.

(cherry picked from commit 96b8747d5c5d747af13fd84d8fe0308ef2a0ea7a)

Fix CHECK_ALLOCATED_AND_LIVE abort during GC

* src/editfns.c (save_restriction_restore):
Wait for the GC to free the temporary markers (Bug#30931).

(cherry picked from commit 670f2ffae718046c0fb37313965a51c040ed096f)

Don't wait for visible frames to become visible

For discussion, see thread starting at
https://lists.gnu.org/archive/html/emacs-devel/2018-03/msg00807.html.
* src/xterm.c (x_make_frame_visible): Check FRAME_VISIBLE_P before
calling x_wait_for_event.

(cherry picked from commits 2a192e21cf3b04b7f830b4971c1508c611e13a3c
and 00c1f771f2a51ffa675ec5a07ea330f2605cd302)

query-replace undo: Handle when user edits the replacement string

* lisp/replace.el (perform-replace): Update the replacement string
after the user edit it (Fix Bug#31538).

* test/lisp/replace-tests.el (query-replace-undo-bug31538): New test.

Backport: (cherry picked from commits
ea133e04f49afa7928e49a3ac4a85b47f6f13f01
and
7dcfdf5b14325ae7996f272f14c72810d7c84944)

Backport: Fix corner case in query-replace-regexp undo

This commit fixes Bug#31492.
* lisp/replace.el (replace-match-maybe-edit): Preserve match data.

* test/lisp/replace-tests.el (query-replace-undo-bug31492): Add test.

(cherry picked from commit bab73230d1be1fe394b7269c1365ef6fb1a5d9b3)

Backport: Preserve case in query-replace undo

If the user query and replaces 'foo' with 'BAR', then
undo must comeback to 'foo', not to 'FOO' (Bug#31073).
* lisp/replace.el (perform-replace): Bind nocasify to non-nil
value during undo/undo-all actions.
* test/lisp/replace-tests.el (query-replace-undo-bug31073): Add test.

(cherry picked from commit 32dc0cb1b5ae895d237c7118ccaeb084715934fd)

Extend file-name-non-special

* lisp/files.el (insert-file-contents-literally):
Bind `inhibit-file-name-handlers' the default way.
(file-name-non-special): Rework, mainly for operations with two
file name arguments.
(file-name-unquote-non-special): New defsubst.
(file-name-unquote): Use it.

* test/lisp/files-tests.el (files-test-bug-18141): Skip if needed.
(files-tests--with-temp-non-special): Add docstring.  Delete also
`non-special-name' if the file/directory exists.
(files-tests--special-file-name-extension)
(files-tests--special-file-name-regexp): New defconst.
(files-tests--special-file-name-handler, files-tests--new-name):
New defuns.
(files-tests--with-temp-non-special-and-file-name-handler): New macro.
(files-tests-file-name-non-special-access-file)
(files-tests-file-name-non-special-add-name-to-file)
(files-tests-file-name-non-special-byte-compiler-base-file-name)
(files-tests-file-name-non-special-copy-directory)
(files-tests-file-name-non-special-copy-file)
(files-tests-file-name-non-special-delete-directory)
(files-tests-file-name-non-special-delete-file)
(files-tests-file-name-non-special-diff-latest-backup-file)
(files-tests-file-name-non-special-directory-file-name)
(files-tests-file-name-non-special-directory-files)
(files-tests-file-name-non-special-directory-files-and-attributes)
(files-tests-file-name-non-special-dired-compress-handler)
(files-tests-file-name-non-special-dired-uncache)
(files-tests-file-name-non-special-expand-file-name)
(files-tests-file-name-non-special-file-accessible-directory-p)
(files-tests-file-name-non-special-file-acl)
(files-tests-file-name-non-special-file-attributes)
(files-tests-file-name-non-special-file-directory-p)
(files-tests-file-name-non-special-file-equal-p)
(files-tests-file-name-non-special-file-executable-p)
(files-tests-file-name-non-special-file-exists-p)
(files-tests-file-name-non-special-file-in-directory-p)
(files-tests-file-name-non-special-file-local-copy)
(files-tests-file-name-non-special-file-modes)
(files-tests-file-name-non-special-file-name-all-completions)
(files-tests-file-name-non-special-file-name-as-directory)
(files-tests-file-name-non-special-file-name-case-insensitive-p)
(files-tests-file-name-non-special-file-name-completion)
(files-tests-file-name-non-special-file-name-directory)
(files-tests-file-name-non-special-file-name-nondirectory)
(files-tests-file-name-non-special-file-name-sans-versions)
(files-tests-file-name-non-special-file-newer-than-file-p)
(files-tests-file-name-non-special-notify-handlers)
(files-tests-file-name-non-special-file-ownership-preserved-p)
(files-tests-file-name-non-special-file-readable-p)
(files-tests-file-name-non-special-file-regular-p)
(files-tests-file-name-non-special-file-remote-p)
(files-tests-file-name-non-special-file-selinux-context)
(files-tests-file-name-non-special-file-symlink-p)
(files-tests-file-name-non-special-file-truename)
(files-tests-file-name-non-special-file-writable-p)
(files-tests-file-name-non-special-find-backup-file-name)
(files-tests-file-name-non-special-get-file-buffer)
(files-tests-file-name-non-special-insert-directory)
(files-tests-file-name-non-special-insert-file-contents)
(files-tests-file-name-non-special-load)
(files-tests-file-name-non-special-make-auto-save-file-name)
(files-tests-file-name-non-special-make-directory)
(files-tests-file-name-non-special-make-directory-internal)
(files-tests-file-name-non-special-make-symbolic-link)
(files-tests-file-name-non-special-rename-file)
(files-tests-file-name-non-special-set-file-acl)
(files-tests-file-name-non-special-set-file-modes)
(files-tests-file-name-non-special-set-file-selinux-context)
(files-tests-file-name-non-special-set-file-times)
(files-tests-file-name-non-special-set-visited-file-modtime)
(files-tests-file-name-non-special-shell-command)
(files-tests-file-name-non-special-start-file-process)
(files-tests-file-name-non-special-substitute-in-file-name)
(files-tests-file-name-non-special-temporary-file-directory)
(files-tests-file-name-non-special-unhandled-file-name-directory)
(files-tests-file-name-non-special-vc-registered)
(files-tests-file-name-non-special-write-region): Extends tests to
quoted file names, which would require a file name handler if unquoted.
(files-test-no-file-write-contents): Make test more robust.

* test/lisp/net/tramp-tests.el (tramp-test21-file-links): Adapt test.
(tramp--test-emacs25-p): New defun.
(tramp-test34-vc-registered): Use it.

Improve buffer naming in sql.el (Bug#31446)

Merge from origin/emacs-26

4cfe531 (origin/emacs-26) Improve ELisp documentation of 'clone-indir...
9089b02 Improve documentation of 'inhibit-message'
6107e12 Improve documentation of comment styles
fb45125 Documentation improvements in newcomment.el
641c94c Imp[rove documentation of 'with-silent-modifications'

; Merge from origin/emacs-26

The following commits were skipped:

6e0ff4c Fix decoding of directories when "~" includes non-ASCII chars
35c1ab1 Don't remove highlight of misspelled word on pdict save
aac541e Fix some problems in the Cairo build
e96245a Avoid infloops in font_open_entity
3a06e72 Fix encoding of characters when using GB18030 fonts
7782550 Fix C-p and C-n when wrap-prefix is too wide
9804482 Avoid redisplay problems with too wide wrap-prefix
5ee9ccf Fix 'posn-at-point' when line numbers are displayed
c4db766 Another followup to fixing 'window-text-pixel-width'
a6cf7be Fix mouse-set-point when line numbers are displayed
ae78b14 * src/xdisp.c (Fwindow_text_pixel_size): Fix last change.
f1f12d8 Fix 'window-text-pixel-size' when display properties are around
8b2b4b5 Fix display of TABs in hscrolled windows with line numbers
de69d28 Fix wait_reading_process_output wait_proc hang

Merge from origin/emacs-26

76f692e Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/emac...

; Merge from origin/emacs-26

The following commit was skipped:

ddd1b95 Fix posn-at-point in Flycheck buffers

Merge from origin/emacs-26

90bea37 ; * etc/PROBLEMS: Fix fvwm version number in last commit
af82d1f * etc/PROBLEMS: Document stickyness problem with FVWM (Bug#31...
4a3aed2 Update Emacs Lisp Intro to match current behavior
21f2247 Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/emac...
3257085 Fix previous commit
6d23525 Fix typos in several manuals (Bug#31610)
9188291 Add detailed documentation about lock files
e5471b2 Add commentary for subtle aspect of frame.el

Conflicts:
doc/lispintro/emacs-lisp-intro.texi

; Merge from origin/emacs-26

The following commit was skipped:

61c8434 ; Auto-commit of loaddefs files.

Merge from origin/emacs-26

ca3f0a8 ; * etc/NEWS: Belated announcement of 2 changes made in Emacs...
99f92da Improve documentation of 'directory-files-and-attributes'
df8649a * lisp/gnus/message.el (message-remove-header): Don't remove ...
b682a7e ; * etc/NEWS: Add headings for Emacs 26.2
aa175a4 Adapt hexl-mode to native line-number display
b8e7749 Fix example in Tramp manual
f212fe5 Handle case where Xft is found but not XRender
186280f * doc/misc/tramp.texi (Frequently Asked Questions): Adapt zsh...
24ba633 Improve read-multiple-choice docstring (Bug#31628)

Conflicts:
etc/NEWS
src/dired.c

Set accessibility subroles for child frame (bug#31324)

; Depends on patch in bug#31440.

* src/nsterm.m (x_set_parent_frame): Set subrole depending on whether
frame is a child or not.

Fix redefinition of child frames on NS

* src/nsterm.m (x_set_parent_frame): If the NSWindow has an existing
parent frame, remove it.

Improve ELisp documentation of 'clone-indirect-buffer'

* doc/lispref/buffers.texi (Indirect Buffers): Be more explicit
about the value of DISPLAY-FLAG in interactive usage.  (Bug#31648)

Improve documentation of 'inhibit-message'

* src/xdisp.c (syms_of_xdisp) <inhibit-message>: Warn against
setting it non-nil globally.  (Bug#31627)

Improve documentation of comment styles

* doc/lispref/syntax.texi (Syntax Flags): Define the "a" style.
(Bug#31624)

Documentation improvements in newcomment.el

* lisp/newcomment.el (uncomment-region)
(uncomment-region-default): Doc fixes.  (Bug#31615)

Imp[rove documentation of 'with-silent-modifications'

* doc/lispref/buffers.texi (Buffer Modification): Document
'with-silent-modifications'.  (Bug#31613)
* doc/lispref/text.texi (Changing Properties): Add a
cross-reference to "Buffer Modification".  Improve wording.

Un-obsolete 'string-to-unibyte'

* lisp/subr.el (string-to-unibyte): No longer obsolete.  See the
emacs-devel discussion around this message:
http://lists.gnu.org/archive/html/emacs-devel/2018-05/msg00656.html.

* etc/NEWS: Announce the change.

Fix decoding of directories when "~" includes non-ASCII chars

* src/fileio.c (Fexpand_file_name): Don't build multibyte strings
from unibyte non-ASCII strings when NAME and DEFAULT_DIRECTORY
have different multibyteness, as this adds bytes to the byte
sequence, and in some situations, e.g., when the home directory
includes non-ASCII characters, can fail file APIs.  (Bug#30755)

* lisp/startup.el (normal-top-level): Make sure default-directory
is set to a multibyte string when decoded on MS-Windows.

(cherry picked from commit 3aab8626ba5080bb04d0fdae52d99c850a842a52)

Don't remove highlight of misspelled word on pdict save

* lisp/textmodes/ispell.el (ispell-pdict-save): Don't restart
flyspell-mode, as bug#11963, which this was supposed to fix, is
fixed better by ispell-command-loop, when the user types 'i' or
'a'.  Restarting Flyspell mode when the personal dictionary is
saved caused bug#31372 as side effect.
(ispell-command-loop): Test 'flyspell-mode', not whether
flyspell-unhighlight-at is fboundp, to determine whether Flyspell
mode is turned on in the current buffer.
(flyspell-unhighlight-at): Add declare-function form for it.

(cherry picked from commit 91e582a31ada28fab5ae55bdbf959a9d30796587)

Fix some problems in the Cairo build

* src/xterm.c (x_begin_cr_clip): Create image surface.
(x_update_end) [USE_CAIRO]: Remove GTK3-specific code.
(x_scroll_run) [USE_CAIRO]: Implement scrolling.
* src/image.c (lookup_rgb_color) [USE_CAIRO]: Support Cairo.
(jpeg_load_body) [USE_CAIRO]: Support Cairo.  Use USE_CAIRO
instead of CAIRO for #ifdef's.
(imagemagick_load_image) [USE_CAIRO]: Support Cairo.
(Bug#31288)

(cherry picked from commit 2d0eff42b8f1122e00f948759ed01a3be1a8c3fc)

Avoid infloops in font_open_entity

* src/font.c (font_open_entity): Fail after 15 iterations through
the loop that looks for a font whose average_width and height are
both positive.  This avoids infinite loops for fonts that, e.g.,
report average_width of zero for any possible size we try.
(Bug#31316)

(cherry picked from commit e2879c1f837059335af89022b2a9ac9bc861e96d)

Fix encoding of characters when using GB18030 fonts

* lisp/international/fontset.el (font-encoding-alist): Fix the
GB18030 entry to encode characters correctly when passing them to
the xfont back-end.  (Bug#31315)  See also
http://lists.gnu.org/archive/html/emacs-devel/2008-01/msg00754.html.

(cherry picked from commit bbe2cadc544e63e9378350621887f8fb9bbcc236)

Fix C-p and C-n when wrap-prefix is too wide

* src/xdisp.c (move_it_in_display_line_to): Avoid looping in
previous/next-line when wrap-prefix is set to a too-wide
stretch of whitespace.  (Bug#30432)

(cherry picked from commit 842b3d7412eaed6b2c9f90c3361abb4932ec0b1d)

Avoid redisplay problems with too wide wrap-prefix

* src/xdisp.c (display_line): Avoid looping in redisplay when
wrap-prefix is set to a too-wide stretch of whitespace.
(Bug#30432)

(cherry picked from commit 2a1fe08307402d6217d073f8ab7737750d253dd4)

Fix 'posn-at-point' when line numbers are displayed

* src/xdisp.c (pos_visible_p): For the leftmost glyph, adjust the X
coordinate due to line-number display.  (Bug#30834)

(cherry picked from commit 4a20174d7949028f66b18a92a75d6b74194242a8)

Another followup to fixing 'window-text-pixel-width'

* src/xdisp.c (Fwindow_text_pixel_size): Adjust the return value
when we stop one buffer position short of TO.  (Bug#30746)

(cherry picked from commit 33cba5405c724566673cf023513bfb1faa963bea)

Fix mouse-set-point when line numbers are displayed

* src/xdisp.c (move_it_to): Initialize the line_number_produced_p
flag before iterating on a new line.  (Bug#30818)

(cherry picked from commit 5c585b8b994aad4e6844f8eed80bdfbb396e91bf)

* src/xdisp.c (Fwindow_text_pixel_size): Fix last change.

(cherry picked from commit 06911714ef66ea81380b1eda75a9f7cfbc9e0b65)

Fix 'window-text-pixel-size' when display properties are around

* src/xdisp.c (Fwindow_text_pixel_size): Correct the result when
there's a display property at the  TO position, and the call to
move_it_to overshoots.  (Bug#30746)

(cherry picked from commit 50e2c0fb5180a757d8d533518f68837ffe5909be)

Fix display of TABs in hscrolled windows with line numbers

* src/dispextern.h (struct it): New members tab_offset and
line_number_produced_p.
* src/xdisp.c (display_line): Don't set row->x to a negative value
if line numbers are being displayed.  (Bug#30582)
Reset the line_number_produced_p flag before laying out the glyph
row.
(x_produce_glyphs): Use the line_number_produced_p flag to decide
whether to offset the X coordinate due to line-number display.
Use the tab_offset member to restore the original TAB width for
alignment purposes.
(move_it_in_display_line_to): Don't produce line numbers when moving
in hscrolled window to the left of first_visible_x.
(maybe_produce_line_number): Set the line_number_produced_p flag.
(Bug#30584)
* src/term.c (produce_glyphs): Correct TAB width only when
line_number_produced_p flag is set.

(cherry picked from commit 1ac190553886ff20817d3dd218464e2fc6f9e42a)

Fix wait_reading_process_output wait_proc hang

* src/process.c (read_process_output): Track bytes read from
a process.
(wait_reading_process_output): If called recursively through
timers and/or process filters via accept-process-output, it is
possible that the output of wait_proc has already been read by
one of those recursive calls, leaving the original call hanging
forever if no further output arrives through that fd and no
timeout has been set.  Fix that by using the process read
accounting to keep track of how many bytes have been read and
use that as a condition to break out of the infinite loop and
return to the caller as well as to calculate the proper return
value (if a wait_proc is given that is).

* src/process.h (struct Lisp_Process): Add nbytes_read to track
bytes read from a process.

(cherry picked from commit 4ba32858d61eee16f17b51aca01c15211a0912f8)

Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/emacs into emacs-26

Fix posn-at-point in Flycheck buffers

* src/dispnew.c (buffer_posn_from_coords): Improve commentary.

* src/xdisp.c (move_it_in_display_line_to): Don't exit the loop
under truncate-lines if the glyph at TO_CHARPOS was not yet
produced.  This avoids bailing out too early when we are at
TO_CHARPOS, but didn't yet produce glyphs for that buffer
position, because the last call to PRODUCE_GLYPHS at this position
was for an object other than the buffer.  For further details, see
http://lists.gnu.org/archive/html/emacs-devel/2018-01/msg00537.html.

(cherry picked from commit c0154ac7c3423f68d8f3a2e85a756c9759219039)

; * etc/PROBLEMS: Fix fvwm version number in last commit

* etc/PROBLEMS: Document stickyness problem with FVWM (Bug#31650)

Fix column double counting in term.el (Bug#31662)

* lisp/term.el (term-emulate-terminal): Invalidate
`term-current-column' after deleting overwritten text.

Minimally support Flymake in Emacs C sources

The check-syntax target is enabled the use of Flymake's "legacy"
backend, flymake-proc-legacy-flymake in src/*.c.  It works quite well
with C sources.  The green light for this change had already been
given some time ago in

https://lists.gnu.org/archive/html/emacs-devel/2017-10/msg00385.html

* src/Makefile.in (check-syntax): New target.
(.PHONY): Add check-syntax.

Update Emacs Lisp Intro to match current behavior

* doc/lispintro/emacs-lisp-intro.texi (Wrong Type of Argument)
(debug, debug-on-entry, Void Function, Void Variable): Update the
*Backtrace* buffer display to current Emacs.  (Bug#31654)

Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/emacs into emacs-26

Fix a typo in emacs-mime.texi (Bug#31610)

Copyright-paperwork-exempt: yes

Fix previous commit

* doc/emacs/files.texi (Interlocking): Two spaces at end of sentence

Fix typos in several manuals (Bug#31610)

Copyright-paperwork-exempt: yes

Add detailed documentation about lock files

* doc/emacs/files.texi (Interlocking): Point user at detailed
file locking description in lisp reference manual.  Add index
entry for '.#' to improve disoverability of information about locking.

* doc/lispref/files.texi (File Locks): Describe in detail what
the form of the lock file is.  Add index entry for '.#' to
improve disoverability of information about locking.

* src/filelock.c (create-lockfiles): Add cross reference to
file locking in user manual and to 'lock-buffer'.  Add string
'.#' to help users find the doc string.

Add commentary for subtle aspect of frame.el

* lisp/frame.el: Explain why we use symbol-function when adding
watchers for certain variables that need to trigger redisplay.

; Auto-commit of loaddefs files.

; Auto-commit of loaddefs files.

; * etc/NEWS: Belated announcement of 2 changes made in Emacs 26.1.

Improve documentation of 'directory-files-and-attributes'

* doc/lispref/files.texi (Contents of Directories): Fix inaccurate
description of the return value of directory-files-and-attributes.

* src/dired.c (Fdirectory_files_and_attributes): Describe the
function's value in more detail.

Obsolete image-jpeg-p

* lisp/image.el (image-jpeg-p): Declare obsolete.

Fdirectory_files_and_attributes doc string clarification

* src/dired.c (Fdirectory_files_and_attributes): Clarify what data
is returned.

Amend c-before-change-check-unbalanced-strings to handle a quote at EOB.

* lisp/progmodes/cc-mode.el (c-before-change-check-unbalanced-strings): Before
going back a sexp from the \n marked with a string-fence syntax-table text
property, check that it is indeed a \n.  If not, simply delete that text
property from the isolated quote, not the quote and the \n which otherwise
delimit an unterminated string.  Should we encounter a double quote marked
with a string-fence syntax-table text property at the end of the last line,
remove that property.

* lisp/gnus/message.el (message-remove-header): Don't remove things
not looking like header (bug#31651).

Work around GCC bug 81401

* src/xterm.c (x_draw_glyphless_glyph_string_foreground):
Make the buffer a byte longer than it needs to be, if
--enable-gcc-warnings.

; * etc/NEWS: Add headings for Emacs 26.2

Adapt hexl-mode to native line-number display

* lisp/hexl.el (hexl-mode-ruler): When display-line-numbers is in
effect, adjust offsets and columns to account for the line-number
display.  (Bug#31595)

bibtex-search-entry: Reuse the window displaying the buffer.

* textmodes/bibtex.el (bibtex-reposition-window): New optional arg
pos.
(bibtex-search-crossref, bibtex-search-entry): Use it.
(bibtex-search-entry): If possible, reuse the window displaying
the buffer that contains the entry found.

bibtex-mark-entry: Display no message.

* textmodes/bibtex.el (bibtex-mark-entry): Display no message.

bibtex-format-entry: Preserve opt-alt if possible.

* textmodes/bibtex.el (bibtex-format-entry):
Preserve opt-alt unless its removal is selected.
(bibtex-parse-entry):  New optional arg keep-opt-alt.

Fix example in Tramp manual

* doc/misc/tramp.texi (Frequently Asked Questions): Fix wording
for the zsh example.

Add Imenu support to CSS mode and its derivatives

* lisp/textmodes/css-mode.el (css--join-nested-selectors)
(css--prev-index-position, css--extract-index-name): New helper
functions for supporting Imenu.
(css-mode): Set `imenu-space-replacement',
`imenu-prev-index-position-function', and
`imenu-extract-index-name-function'.
(css-current-defun-name): Reuse `css--prev-index-position' and
`css--extract-index-name' to support nested selectors.

* test/lisp/textmodes/css-mode-tests.el (css-test-current-defun-name):
Fix character index.
(css-test-join-nested-selectors): New tests for
`css--join-nested-selectors'.

* etc/NEWS: Add news entry.

Handle case where Xft is found but not XRender

* configure.ac (XFT_LIBS): Ensure that HAVE_XFT is no if
XRender is not found.  (Bug#31634)

Allow access to MS-Windows Registry from Lisp programs

* src/w32.c (g_b_init_reg_open_key_ex_w)
(g_b_init_reg_query_value_ex_w)
(g_b_init_expand_environment_strings_w): New init flags.
(globals_of_w32): Initialize them at startup.
(RegOpenKeyExW_Proc, RegQueryValueExW_Proc)
(ExpandEnvironmentStringsW_Proc): New function typedefs.
(reg_open_key_ex_w, reg_query_value_ex_w)
(expand_environment_strings_w): New wrapper function.
(w32_read_registry): New function.
* src/w32fns.c (Fw32_read_registry) [WINDOWSNT]: New primitive.
(syms_of_w32fns) [WINDOWSNT]: Defsubr it.  DEFSYM "HKLM", "HKCU",
etc. root keys.

* etc/NEWS: Mention the new primitive.