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(macroexp-unprogn): Make sure we never return an empty list.
(macroexp-if): Remove unused (and unsafe) optimization.
Optimize (if A T (if B T E)) into (if (or A B) T E) instead, which does
occur occasionally.

* lisp/simple.el (delete-trailing-whitespace): Save match data when
calling `skip-syntax-backward'.
* test/automated/simple-test.el (simple-delete-trailing-whitespace):
New test.

where string ends in space

* doc/lispref/sequences.texi (Sequence Functions): Document seq-mapn

(character-fold-to-regexp): Rework internals to play nice with
lax-whitespacing.

When the user types a space, we want to match the table entry for
?\s, which is generally a regexp like "[ ...]".  However, the
`search-spaces-regexp' variable doesn't "see" spaces inside these
regexp constructs, so we need to use "\\( \\|[ ...]\\)" instead (to
manually expose a space).

Furthermore, the lax search engine acts on a bunch of spaces, not
on individual spaces, so if the string contains sequential spaces
like "  ", we need to keep them grouped together like this:
"\\(  \\|[ ...][ ...]\\)".

(isearch--momentary-message): New function.
(isearch-toggle-lax-whitespace, isearch-toggle-case-fold)
(isearch-toggle-invisible): Use it.

(isearch-define-mode-toggle): New macro.
(isearch-toggle-invisible): Renamed to
`isearch-define-mode-toggle'.
(isearch-toggle-case-fold, isearch-toggle-invisible)
(isearch-toggle-regexp, isearch-toggle-lax-whitespace): Define
with `isearch-define-mode-toggle'.

* lisp/net/tramp-compat.el (tramp-compat-delete-dups): New defun.
* lisp/net/tramp-smb.el (tramp-smb-handle-directory-files): Use it.

* lisp/net/tramp-smb.el (tramp-smb-handle-directory-files):
Revert 692bce5b, `delete-dups'
does not exist in XEmacs 21.4.

Input events started to arrive before ns_term_init() was finished.
Solved by blocking input. This also seems to correct the "You
can't open the application "Emacs" because it may be damaged or
incomplete" error issued when double-clicking on the Emacs
application.

* nsterm.m (ns_constrain_all_frames, ns_init_term): Block input.
* nsterm.m (ns_send_appdefined, EmacsApp): Trace output.

Document the fact that it doesn't return dead processes.

* nsterm.h (struct ns_output): New flag, in_animation.
* nsfns.m (Fx_create_frame): Initialize in_animation flag.
* nsmenu.m (free_frame_tool_bar, update_frame_tool_bar): Set
in_animation flag around call to "setVisible". Set new tool bar
height before call to setVisible.
* nsterm.m (x_set_window_size): Don't call [view setRow:
andColumns:] as this fools the subsequent call to updateFrameSize
from performing the real resize.
(windowDidResize): Don't update anything when in_animation is
non-zero.

Trace output.

* nsmenu.m (free_frame_tool_bar, update_frame_tool_bar)
(EmacsToolbar):
* nsterm.m (x_set_window_size, updateFrameSize)
([EmacsView setRows: andColumns:])

* lisp/textmodes/tex-mode.el (tex--prettify-symbols-compose-p): Prettify
macros which don't end in a word character.

This reverts commit 5e439554.

(http://lists.gnu.org/archive/html/emacs-devel/2015-10/msg02009.html)

* lisp/vc/vc-hg.el (vc-hg-log-format): Pipe commit description
through 'tabindent'.
(vc-hg-log-view-mode): Set tab-width to 2 locally.
(http://lists.gnu.org/archive/html/emacs-devel/2015-10/msg02259.html)

* lisp/net/tramp-smb.el (tramp-smb-handle-directory-files): Use `delete-dups'.
* lisp/net/tramp.el (auto-save-file-name-transforms): Declare.

(ccl-compile-if): Remove unused var `false-ic'.
(ccl-compile-write-repeat): Remove unused var `i'.
(ccl-compile-map-single): Remove unused var `id'.
(ccl-dump, ccl-dump-binary): Use explicit let-binding to bind the
dynamic var `ccl-code'.

(help-add-fundoc-usage): Don't mistake a mis-formatted string for a list.

(gnus-topic-prepare-topic): Remove unused var `topic'.
(gnus-topic-remove-topic): Mark unused arg `hide'.
(gnus-tmp-header): Declare.
(gnus-topic-goto-missing-group): Remove unused var `entry'.
(gnus-topic-unmark-topic): Mark unused arg `dummy'.
(gnus-topic-copy-matching): Mark unused arg `copyp'.
Move initialization of `topic' into its declaration.

* lisp/cedet/cedet-global.el (cedet-gnu-global-gtags-call): Handle
warnings from gtags about invalid options.
(cedet-gnu-global-create/update-database): Do incremental update
properly.

* lisp/cedet/ede/generic.el (ede-enable-generic-projects): Get monotone
root right.

* lisp/autorevert.el (auto-revert-notify-handler): When a
`stopped' event arrives from file notification, fall back to polling.

* test/automated/file-notify-tests.el
(file-notify-test03-autorevert): Extend test for polling when file
notification ceases to work.

* lisp/vc/vc-hg.el (vc-hg-log-format): New variable.
(vc-hg-print-log, vc-hg-expanded-log-entry): Use it.
(http://lists.gnu.org/archive/html/emacs-devel/2015-10/msg02191.html)

* etc/images/icons/hicolor/scalable/apps/emacs.svg: Use a plain SVG
  format instead of the Inkscape SVG format.

* test/automated/auto-revert-tests.el
(auto-revert-test02-auto-revert-mode-dired): Narrow *Messages*
buffer where it belongs to.  (Bug#21668)

* doc/lispref/files.texi (Directory Names): Define and use "directory
file name". Recommend `expand-file-name'.

* src/lread.c (load-path): Fix doc string; elements are directory file
names.

* test/automated/simple-test.el (simple-test--dummy-buffer): Make
sure indentation doesn't use TABs, otherwise the 6th test might
fail.

`substring' does not account for full width characters.