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Unify shutdown handling under NS, via ns-power-off key event (where appropriate) and save-buffers-kill-emacs.

remove  NS-specific preferences window that used to show NS-specific preferences.
Integrate preferences in Lisp accessible customization system where possible.
Remove ns-expand-space, because it can be set only during fontloading (i.e. not at runtime),
and because of redundancy with line-spacing frame parameter.

Remove loading of most and saving of all NS resources (from org.gnu.Emacs.plist).

nsterm.m (ns_shutdown_properly, -terminate): remove global state variable as it was never reset
(ns_term_init): remove initialization of Lisp-settable defaults and ns_expand_space
(-setPanelFromDefaultValues): remove ns_expand_space.
(-showPreferencesWindow): send new KEY_NS_SHOW_PREFS key.

nsfont.m (nsfont_open): remove ns_expand_space, assume -0.5 i.e. no additional spacing, similar to Carbon port.

nsterm.h: define KEY_NS_SHOW_PREFS key.
nsfns.m (ns-popup-prefs-panel): remove.

term/ns-win.el (ns-expand-space): remove.
(ns-show-prefs event): run `customize'.
(ns-power-off): run `save-buffers-kill-emacs', but ask user whether to save files (as is standard)
(clipboard-yank, clipboard-kill-ring-save, clipboard-kill-region)
(menu-bar-enable-clipboard): do not undefine these.
(ns-save-preferences,ns-save-options,ns-show-preferences-help): remove.

(mail-yank-ignored-headers): Add X-RMAIL- headers, bump :version.
(mail-setup): Use the function mail-signature.
(mail-to, mail-subject, mail-cc, mail-bcc, mail-reply-to)
(mail-mail-reply-to, mail-mail-followup-to): Doc fixes.
(mail-signature): Check the signature file is readable.
With the argument ATPOINT, really insert at point.
Handle the case when the variable mail-signature is an expression.

defined in the warnings library (Bug#2668).

warning-suppress-types is defined in the warnings
library (Bug#2668).

expects a list, pass a list.

_pcm_sw_params_set_xfer_align.

	after clicking in a detached tool bar.
	(xg_tool_bar_proxy_callback): Remove call to Fx_focus_frame.

modified status before running the major-mode.

event message.

Fall back to original commit if vc-git-symbolic-commit fails to
find a symbolic name.
(vc-git-symbolic-commit): Don't limit search to tags. Treat
"undefined" as an error. (Bug #2110)

packages, as well as Opkg/Ipkg packages.

(tar-summarize-buffer): Don't silently skip incomplete headers.
(tar-mode): Revert to fundamental-mode in case of malformed tar data.
(tar-extract): Try to make sure set-auto-mode doesn't mistakenly
treat a tar file member as being a tar file itself, just because
its own filename includes the parent tar file's.

Hanlde NAME nil and t correctly.  Callers changed.
(font_def_arg, add_arg, from_arg, to_arg): Delete them.
(set_fontset_font): Change ARG to a vector.  Handle range_list in
ARG correctly.
(Fset_fontset_font): Fix the case that TARGET is both a script
name and charset name.  Adjusted the arg to set_fontset_font for
the above change.
(fontset_from_font): Fix previous change.
(Ffontset_info): Adjusted for the 2008-07-09 change of fontset
entry.  If FONTSET is the default fontset, don't set the extra
slot of the returning char-table.

argument FONTSET changed for consistency.  Reorder the printed
information to match with the font searching strategy.
(describe-fontset): Use face-attribute to get the fontset of the
selected frame.
(mule-diag): Likewise.  Print both font and fontset of the frame.

`set-fontset-font' and `print-fontset'.