* lisp/progmodes/gud.el (ctl-x-map): Remove C-x SPC binding.
(gud-jdb-find-source-using-classpath): Remove ((lambda (..)..)..).

Fix bug #15892 with link failures of the Cygwin w32 build.

 src/keyboard.c (make_ctrl_char) [HAVE_NTGUI]: Now externally visible
 for Cygwin w32 build.
 src/xdisp.c (erase_phys_cursor) [HAVE_NTGUI]: Now externally visible
 for Cygwin w32 build.

* lisp/subr.el (version-regexp-alist):
Recognize hg, svn and darcs versions as snapshot versions.

* lisp/progmodes/ruby-mode.el (ruby-mode-set-encoding):
Fix and simplify encoding comment update logic.

Auto-commit of loaddefs files.

* lisp/progmodes/ruby-mode.el (ruby-mode-set-encoding):
Add support for always inserting an utf-8 encoding comment.

* doc/lispref/loading.texi (Library Search): Update section.

* net/tramp-gvfs.el (top): Run init code only when
`tramp-gvfs-enabled' is not nil.
(tramp-gvfs-enabled): Check also :system bus.

Sync with upstream verilog-mode revision 78e66ba.
* lisp/progmodes/verilog-mode.el (verilog-end-of-defun)
(verilog-type-completion, verilog-get-list): Remove unused funcs.
(verilog-get-end-of-defun): Remove unused argument.
(verilog-comment-depth): Remove unused local `e'.
(verilog-read-decls, verilog-read-sub-decls, verilog-read-instants):
Don't pass arg to verilog-get-end-of-defun.

* lisp/obsolete/assoc.el (aget): Prefix dynamic variable.

* lisp/allout-widgets.el (allout-widgets): No need to autoload defgroup.

Simplify, port and tune bool vector implementation.

* configure.ac (BITSIZEOF_SIZE_T, SIZEOF_SIZE_T): Remove.
* src/alloc.c (bool_vector_exact_payload_bytes)
(bool_vector_payload_bytes): Remove.
(bool_vector_fill): Return its argument.
* src/alloc.c (bool_vector_fill):
* src/lread.c (read1):
* src/print.c (print_object):
Simplify by using bool_vector_bytes.
* src/alloc.c (make_uninit_bool_vector):
New function, broken out from Fmake_bool_vector.
(Fmake_bool_vector): Use it.  Use tail call.
(make_uninit_bool_vector, vector_nbytes): Simplify size calculations.
* src/data.c (BITS_PER_ULL): New constant.
(ULLONG_MAX, count_one_bits_ll): Fall back on long counterparts
if long long versions don't exist.
(shift_right_ull): New function.
(count_one_bits_word): New function, replacing popcount_bits_word
macro.  Don't assume that bits_word is no wider than long long.
(count_one_bits_word, count_trailing_zero_bits):
Don't assume that bits_word is no wider than long long.
* src/data.c (bool_vector_binop_driver, bool_vector_not):
* src/fns.c (Fcopy_sequence):
* src/lread.c (read1):
Create an uninitialized destination, to avoid needless work.
(internal_equal): Simplify.
(Ffillarray): Prefer tail call.
* src/data.c (bool_vector_binop_driver): Don't assume bit vectors always
contain at least one word.
(bits_word_to_host_endian): Prefer if to #if.  Don't assume
chars are narrower than ints.
* src/data.c (Fbool_vector_count_matches, Fbool_vector_count_matches_at):
* src/fns.c (Fcopy_sequence):
Simplify and tune.
* src/lisp.h (bits_word, BITS_WORD_MAX, BITS_PER_BITS_WORD):
Don't try to port to hosts where bits_word values have holes; the
code wouldn't work there anyway.  Verify this assumption, though.
(bool_vector_bytes): New function.
(make_uninit_bool_vector): New decl.
(bool_vector_fill): Now returns Lisp_Object.

Prefer tail calls.

* lib-src/ebrowse.c (xstrdup):
* lib-src/etags.c (savenstr):
* lwlib/lwlib.c (safe_strdup):
* src/xfns.c (xic_create_fontsetname):
* src/xrdb.c (gethomedir): Prefer tail calls.
* lib-src/etags.c (concat): Omit unnecessary assignment.

* lisp/widget.el, lisp/hfy-cmap.el: Remove bogus package version number.

lisp/gnus/gnus-icalendar.el: Fix for gnus-icalendar handling of empty appt locations; gnus-icalendar can update org entry for canceled appointments

* lisp/replace.el (replace-eval-replacement): Try to give more helpful error
message.

Fixes: debbugs:15836

* lisp/arc-mode.el (archive-7z-extract, archive-7z-expunge)
(archive-7z-update): Avoid custom type mismatches.

* lisp/vc/vc.el (vc-diff-knows-L): Remove; unused since 2007-10-10.

* automated/file-notify-tests.el (file-notify-test02-events)
(file-notify-test03-autorevert): Suppress messages in `write-region'.

* automated/tramp-tests.el (tramp-test02-file-name-dissect)
(tramp-test03-file-name-defaults, tramp-test21-file-links): Add tests.
(tramp-test26-process-file, tramp-test28-shell-command): Ensure,
that the directory is not empty when calling "ls".

* net/tramp.el (tramp-remote-file-name-spec-regexp): An IPV6
address can be empty.

* net/tramp-gvfs.el (tramp-gvfs-handle-insert-directory):
Accept nil SWITCHES.
(tramp-gvfs-handle-write-region): Implement APPEND.

* Makefile.in (ACLOCAL_INPUTS): Add configure.ac.

lisp/gnus/gnus-icalendar.el (gnus-icalendar-event-from-ical): Fix timezone handling in gnus-icalendar export to org

org-agenda.el (org-agenda-set-restriction-lock): Autoload

* org-agenda.el (org-agenda-set-restriction-lock): Autoload.

Remove non-existent files in Org 8.2.3a

Address some byte-compiler warnings.
* lisp/org/ob-abc.el (org-babel-expand-body:abc): Use dolist.
(org-babel-execute:abc): Fix regexp quoting.
* lisp/org/ob-calc.el (org--var-syms): Rename from `var-syms'.
* lisp/org/ob-lilypond.el (ly-compile-lilyfile): Remove redundant let-binding.
* lisp/org/ob-table.el (sbe): Move debug declaration.
* lisp/org/org-clock.el (org--msg-extra): Rename from `msg-extra'.
* lisp/org/org.el (org-version): Avoid var name starting with _.
(org-inhibit-startup, org-called-with-limited-levels)
(org-link-search-inhibit-query, org-time-was-given)
(org-end-time-was-given, org-def, org-defdecode, org-with-time):
* lisp/org/org-colview.el (org-agenda-overriding-columns-format):
* lisp/org/org-agenda.el (org-agenda-multi, org-depend-tag-blocked)
(org-agenda-show-log-scoped):
* lisp/org/ob-python.el (py-which-bufname, python-shell-buffer-name):
* lisp/org/ob-haskell.el (org-export-copy-to-kill-ring):
* lisp/org/ob-exp.el (org-link-search-inhibit-query):
* lisp/org/ob-R.el (ess-eval-visibly-p):
* lisp/org/ob-core.el (org-src-window-setup): Declare before use.
(org-babel-expand-noweb-references): Remove unused `blocks-in-buffer'.
* lisp/org/ox-odt.el (org-odt-hfy-face-to-css):
* lisp/org/org-src.el (org-src-associate-babel-session, org-src-get-lang-mode):
* lisp/org/org-bibtex.el (org-bibtex-get, org-bibtex-ask, org-bibtex)
(org-bibtex-check):
* lisp/org/ob-tangle.el (org-babel-tangle, org-babel-spec-to-string)
(org-babel-tangle-single-block, org-babel-tangle-comment-links):
* ob-table.el (sbe):
* lisp/org/ob-sqlite.el (org-babel-sqlite-expand-vars):
* lisp/org/ob-sql.el (org-babel-sql-expand-vars):
* lisp/org/ob-shen.el (org-babel-execute:shen):
* lisp/org/ob-sh.el (org-babel-execute:sh, org-babel-sh-evaluate):
* lisp/org/ob-scala.el (org-babel-scala-evaluate):
* lisp/org/ob-ruby.el (org-babel-ruby-table-or-string)
(org-babel-ruby-evaluate):
* ob-python.el (org-babel-python-table-or-string)
(org-babel-python-evaluate-external-process)
(org-babel-python-evaluate-session):
* lisp/org/ob-picolisp.el (org-babel-execute:picolisp):
* lisp/org/ob-perl.el (org-babel-perl-evaluate):
* lisp/org/ob-maxima.el (org-babel-execute:maxima):
* lisp/org/ob-lisp.el (org-babel-execute:lisp):
* lisp/org/ob-java.el (org-babel-execute:java):
* lisp/org/ob-io.el (org-babel-io-evaluate):
* ob-haskell.el (org-babel-execute:haskell):
* lisp/org/ob-fortran.el (org-babel-execute:fortran):
* ob-exp.el (org-babel-exp-code):
* lisp/org/ob-emacs-lisp.el (org-babel-execute:emacs-lisp):
* lisp/org/ob-ditaa.el (org-babel-execute:ditaa):
* ob-core.el (org-babel-execute-src-block, org-babel-sha1-hash)
(org-babel-parse-header-arguments, org-babel-reassemble-table)
(org-babel-goto-src-block-head, org-babel-mark-block)
(org-babel-expand-noweb-references, org-babel-script-escape)
(org-babel-process-file-name):
* lisp/org/ob-clojure.el (org-babel-execute:clojure):
* ob-calc.el (org-babel-execute:calc):
* lisp/org/ob-awk.el (org-babel-execute:awk):
* ob-abc.el (org-babel-execute:abc):
* ob-R.el (org-babel-expand-body:R):
* lisp/org/ob-C.el (org-babel-C-execute): Avoid deprecated ((lambda) ...).

Add missing ChangeLog from previous commit

Fix and standardize some copyright and license notices

* ob-abc.el: Add year, part of Emacs, standardize license text.

* ob-ebnf.el: Part of Emacs, standardize license text.

* ob-makefile.el: Fix years.

* org-macro.el, ox-beamer.el, ox-latex.el, ox-org.el: Part of Emacs.

* ox-ascii.el, ox-md.el, ox.el: Use range for years, part of Emacs.

* ox-html.el: Part of Emacs.
(org-html-scripts): Add 2013 to copyright years.
(org-html-infojs-template): Set copyright holder to FSF.

* ox-icalendar.el: Part of Emacs, fix years.

* ox-texinfo.el: Copyright to FSF, use range for years.

lisp/org/ChangeLog: remove references to org-taskjuggler.el

Remove org-taskjuggler.el as it's not part of Org 8.2.3a

Remove org-docbook.el, which is not in Org 8.2.3a.
Fix error in org.texi header.

Thanks to Sean Sieger and Michael Albinus for reporting this.

* lisp/progmodes/ruby-mode.el (ruby-smie-grammar): Disambiguate between
binary "|" operator and closing block args delimiter.  Remove
FIXME comment referring to Ruby 1.8-only syntax.
(ruby-smie--implicit-semi-p): Not after "|" operator.
(ruby-smie--closing-pipe-p): New function.
(ruby-smie--forward-token, ruby-smie--backward-token): Use it.
(ruby-smie-rules): Indent after "|".

Fix previous commit: remove files that are not part of Org 8.2.3a anymore

Merge Org version 8.2.3a.

* ps-print.el (ps-face-attribute-list): Handle anonymous faces

Fixes: debbugs:15827

Fix doc-string of display-buffer-other-frame.  (Bug#15868)

* window.el (display-buffer-other-frame): Fix doc-string.
(Bug#15868)

* xterm.c (syms_of_xterm): staticpro Qalt, Qhyper, Qmeta, and Qsuper.

This is safer, and it's what w32fns.c does.

* xterm.c (syms_of_xterm): staticpro Qmodifier_value.

* configure.ac: test portability fix
  (I can never remember whether this is still relevant or not)

Remove nt/msysconfig.sh

* configure.ac [MINGW32]: Source nt/mingw-cfg.site.

* make-dist: Don't distribute nt/msysconfig.sh.

* nt/msysconfig.sh: Remove.

* nt/INSTALL: Update for this.

* nt/mingw-cfg.site: Comment.

* Makefile.in (epaths-force-w32): Simplify w32srcdir computation.

* buffer.c (Fforce_mode_line_update): Don't fall off end of function

that requires a return value.
(Fset_buffer_modified_p): Take advantage of this change to do
a tail call.

Doc fixes.

* doc/lispref/os.texi (User Identification, Time of Day, Time Conversion): Minor fixes.

* lisp/subr.el (force-mode-line-update): Delete, move to buffer.c.
* src/buffer.c (Frestore_buffer_modified_p): Sync it with
Fset_buffer_modified_p.
(Fforce_mode_line_update): New function, moved from subr.el.
(Fset_buffer_modified_p): Use them.
(syms_of_buffer): Defsubr Fforce_mode_line_update.

* search.c (find_newline): Rewrite to prefer offsets to pointers.

This avoids undefined behavior when subtracting pointers into
different aways.  On my platform it also makes the code a tad
smaller and presumably faster.

* automated/tramp-tests.el (tramp-test-temporary-file-directory):
Check $TRAMP_TEST_TEMPORARY_FILE_DIRECTORY.
(tramp-read-passwd): Check $TRAMP_TEST_ALLOW_PASSWORD.
(tramp-test09-insert-file-contents, tramp-test10-write-region):
(tramp-test26-process-file): Add tests.
(tramp-test11-copy-file): Remove debug message.
(tramp-test20-file-modes): Special case, if user is "root".

* net/tramp-sh.el (tramp-do-copy-or-rename-file-via-buffer)
(tramp-sh-handle-file-local-copy): Don't write a message when
saving temporary files.

* net/tramp-smb.el (tramp-smb-handle-copy-directory): Fix bug when
both directories are remote.
(tramp-smb-handle-directory-files): Do not return double entries.
Do not expand full file names.
(tramp-smb-handle-insert-directory): Accept nil SWITCHES.
(tramp-smb-handle-write-region): Implement APPEND.
(tramp-smb-get-stat-capability): Fix a stupid bug.

* lisp/bindings.el (ctl-x-map): Bind C-x SPC to rectangle-mark-mode.
* src/keyboard.c (command_loop_1): Use region-extract-function.
* src/insdel.c (Qregion_extract_function): Not static any more (can we
stop pretending that these vars can benefit from being marked static?).

* lisp/emacs-lisp/cconv.el (cconv-convert): Print warning instead of
throwing error over malformed let/let*.

Fixes: debbugs:15814

* lisp/iswitchb.el (iswitchb-mode): Mark obsolete.

* make-dist: Comment

Update from Unicode 6.2.0 to 6.3.0

Note: I used Emacs 24.3 to generate the uni-*.el files, owing to
unexplained (possibly harmless) differences that the current trunk's
use of lexical-binding for subr.el causes.  Ref:
http://debbugs.gnu.org/15825#29

* admin/unidata/BidiMirroring.txt, admin/unidata/UnicodeData.txt:
Update to 6.3.0.

* lisp/international/uni-bidi.el, lisp/international/uni-category.el:
* lisp/international/uni-name.el, lisp/international/uni-numeric.el:
Regenerate.

* admin/unidata/unidata-gen.el (unidata-gen-files): Tweak whitespace
in generated files.

* keymaps.texi (Tool Bar): Mention that Gtk+/NS ignores item 1 to 3.

* net/tramp.el (tramp-methods):
* net/tramp-sh.el (tramp-compute-multi-hops): Revert change of
2013-10-29T02:50:24Z!dancol@dancol.org.

Fix bug #15841 with missing line numbers in linum-mode.

 src/search.c (find_newline): If buffer text is relocated during the
 "dumb loop", adjust C pointers into buffer text to follow suit.

* gtkutil.c (xg_check_special_colors): Use rgb: instead of rgbi:
for conversion.

Fixes: debbugs:15837

Fix bug #15841 with cache-long-scans, linum-mode, and non-ASCII chars.

 src/fileio.c (Finsert_file_contents): Invalidate the newline cache
 for the entire range of inserted characters.

* progmodes/sh-script.el (sh-font-lock-keywords-var): Force
highlighting text after Summary keyword in doc face for rpm.

Add an cross-reference.

* doc/lispref/os.texi (Command-Line Arguments): Add cross-reference
  for `dump-emacs'.

* doc/lispref/os.texi (Startup Summary): Typo fix.

* doc/lispref/os.texi (Startup Summary): Add an index about startup screen.

* lisp/textmodes/ispell.el (ispell-lookup-words): When `look' is not
available and the word has no wildcards, append one to the grep
pattern.
http://lists.gnu.org/archive/html/emacs-devel/2013-11/msg00258.html
(ispell-complete-word): Call `ispell-lookup-words' with the value
independent of `ispell-look-p'.

* nt/mingw-cfg.site: No need for this to be executable.

* admin/unidata/unidata-gen.el (unidata-gen-files):
Fix deletion of existing output files after 2013-10-30 changes.

* lisp/progmodes/ruby-mode.el (ruby-smie--implicit-semi-p):
Not after "||".
(ruby-smie-rules): Indent non-hanging "begin" blocks as part of
their parent.

* lisp/progmodes/ruby-mode.el: Don't require cl any more.  Use pcase instead.
(ruby-font-lock-keywords): Use backquote.

* lisp/progmodes/ruby-mode.el (ruby-mode-set-encoding):
Fix incorrect case conditions.

* lisp/progmodes/ruby-mode.el (ruby-smie--forward-token)
(ruby-smie--backward-token): Only consider full-string matches.

* lisp/faces.el (describe-face): Add distant-foreground.

* src/xfaces.c (lface_fully_specified_p): Let distant-foreground be
unspecified.
(realize_default_face): Remove assignment to distant-foreground if
unspecified.

Fixes: debbugs:15815

Merge from gnulib.

This incorporates:
2013-11-08 extern-inline: port better to OS X 10.9
2013-11-08 fpending: fix regression on DragonFly BSD
* lib/fpending.h, m4/extern-inline.m4, m4/fpending.m4:
Update from gnulib.

* lisp/progmodes/ruby-mode.el (ruby-mode-set-encoding): Use
`ruby-encoding-magic-comment-style' to control the
style of the auto-inserted encoding comment.

* lisp/progmodes/ruby-mode.el (ruby-smie--indent-to-stmt): Use
`smie-backward-sexp' with token argument.

Documentation followup to last commit.

 doc/lispref/display.texi (Truncation): Document that cache-long-scans is now
 non-nil by default.  (Bug#15797)

Switch cache-long-scans to t by default.

 src/xdisp.c (message_dolog): Make sure the *Messages* buffer has its
 cache-long-scans disabled, since we don't want to call
 prepare_to_modify_buffer (in insert_1_both) for each message we
 display.
 src/buffer.h (bset_cache_long_scans): New INLINE function, moved
 from buffer.c.  Improve commentary to the buffer field setter
 functions.
 src/buffer.c (bset_cache_long_scans): Static function deleted.
 Improve commentary to the buffer field setter functions.
 (init_buffer_once): Default for cache-long-scans changed to t.
 (Bug#15797)

* net/tramp-sh.el (tramp-set-remote-path, tramp-get-ls-command):
Remove instrumentation code.

* automated/file-notify-tests.el:
* automated/tramp-tests.el: Add `tramp-own-remote-path' to
`tramp-remote-path' when running on hydra.
(tramp-test07-file-exists-p): Remove instrumentation code.
(tramp-test26-process-file): Don't use "/bin/true" and
"/bin/false", these paths do not exist on hydra.

Fix a typo in (epa) Encrypting/decrypting *.gpg files

Add missing ChangeLog entry from 2013-06-05T01:58:43Z!monnier@iro.umontreal.ca
http://lists.gnu.org/archive/html/emacs-diffs/2013-06/msg00043.html

* automated/tramp-tests.el: Add `tramp-own-remote-path' to `tramp-remote-path'.

* lisp/progmodes/autoconf.el (autoconf-mode): Tweak comment-start-skip.
See also http://debbugs.gnu.org/10033

Fixes: debbugs:15822

* chartab.c (make_sub_char_table): Fix size typo.

This bug was introduced in my 2013-06-21 change, and caused
struct Lisp_Sub_Char_Table objects to be given too many slots,
which broke 'make -C admin/unidata'.

Fixes: debbugs:15825

Rename test/automated/sentinel-tests.el to process-tests.el

* lisp/progmodes/sh-script.el (sh-smie--sh-keyword-in-p): Don't inf-loop
at bobp.
(sh-smie--sh-keyword-in-p): Recognize keywords at bobp.

Fixes: debbugs:15826

* lisp/man.el (Man-start-calling): New macro, extracted from
Man-getpage-in-background.
(Man-getpage-in-background): Use it.
(Man-update-manpage): New command.
(Man-mode-map): Bind it.

* indent/ruby.rb: New example

* test/automated/sentinel-tests.el: New file.

* lisp/progmodes/ruby-mode.el (ruby-smie-grammar): Improve precedences
of "and", "or", "&&" and "||".
(ruby-smie--args-separator-p): Prohibit keyword "do" as the first
argument.  Prohibit opening curly brace because it could only be a
block opener in that position.
(ruby-smie--forward-token, ruby-smie--backward-token): Separate
"|" from "&" or "*" going after it.  That can happen in block
arguments.
(ruby-smie--indent-to-stmt): New function, seeks the end of
previous statement or beginning of buffer.
(ruby-smie-rules): Use it.
(ruby-smie-rules): Check if there's a ":" before a curly block
opener candidate; if there is, it's a hash.

* test/indent/ruby.rb: New examples.

Import macfont changes from mac-port 4.5.
* macfont.h (kCTVersionNumber10_9): Define if not defined.

* macfont.m (mac_font_copy_default_descriptors_for_language)
(mac_font_copy_default_name_for_charset_and_languages): Declare.
(cf_charset_table): big-5-0 has uniquifier 0x4EDC.
(macfont_language_default_font_names): New.
(macfont_list): Rearrange language/charset code.
(macfont_close): Don't check for macfont_info->cache.
(mac_ctfont_create_preferred_family_for_attributes): New font
selection code, call
mac_font_copy_default_name_for_charset_and_languages.
(mac_font_copy_default_descriptors_for_language)
(mac_font_copy_default_name_for_charset_and_languages): New functions.

* lisp/emacs-lisp/cl-macs.el (cl-symbol-macrolet): Use macroexp-progn.
(cl--block-wrapper): Fix last accidental change.

* net/tramp-sh.el (tramp-set-remote-path, tramp-get-ls-command):
Instrument, in order to hunt failure on hydra.

* admin/unidata/unidata-gen.el (unidata-gen-files): Update Unicode copyright

Update unicode README and related info

Port to C11 aligned_alloc, and fix some integer overflows.

* configure.ac (GMALLOC_OBJ): Initialize to empty if !system_malloc
and doug_lea_malloc.
(aligned_alloc): Test for existence if !GMALLOC_OBJ and not darwin.
(posix_memalign): Test for existence only if !GMALLOC_OBJ and
not darwin and !aligned_alloc.
* src/alloc.c (USE_ALIGNED_ALLOC): New symbol.
(USE_POSIX_MEMALIGN): Remove.  All uses replaced with USE_ALIGNED_ALLOC,
and use of posix_memalign replaced with aligned_alloc.
(aligned_alloc): New function, defined or declared as needed.
* src/conf_post.h (HAVE_POSIX_MEMALIGN) [DARWIN_OS]:
Don't undef; configure.ac now does this.
* src/gmalloc.c (aligned_alloc) [MSDOS]: New decl.
(calloc, aligned_alloc): Check for integer overflow.
(aligned_alloc): Rename from memalign.  All uses changed.
(memalign): New function, an alias for aligned_alloc.

* lisp/emacs-lisp/cl-macs.el (cl-symbol-macrolet): Print warning for
malformed bindings form.

Fixes: debbugs:15814

* admin/unidata/unidata-gen.el (unidata-gen-files): Disable version-control
in generated files.

* lisp/progmodes/ruby-mode.el (ruby-smie--implicit-semi-p):
No implicit semi after "^", "and" or "or".
(ruby-smie-grammar): New tokens: "and" and "or".
(ruby-smie--args-separator-p): Fix the check for tokens at POS.
Exclude "and" and "or".  Remove "do" in order to work around token
priorities.
(ruby-smie-rules): Add all infix tokens.  Handle the case of
beginning-of-buffer.

* lisp/progmodes/ruby-mode.el (ruby-smie-grammar): Lower priority of
"." compared to "do".

* src/xdisp.c (redisplay_internal): Fix typo in last change.

* regex.c: Fix --enable-gcc-warning glitch with GCC 4.5.2.

* src/xdisp.c (syms_of_xdisp): New vars redisplay--all-windows-cause and
redisplay--mode-lines-cause.
(redisplay_internal): Keep them uptodate.  Remove redundant check of
buffer_shared_and_changed.
* *.[chm]: Number every assignment to update_mode_lines so we
can track why it is set.