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GNU Emacs NEWS -- history of user-visible changes.  2002-12-08
Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
See the end for copying conditions.

Please send Emacs bug reports to [e-mail].
For older news, see the file ONEWS


* Installation changes in Emacs 21.3

** Support for GNU/Linux on little-endian MIPS and on IBM S390 has
been added.


* Changes in Emacs 21.3

** The obsolete C mode (c-mode.el) has been removed to avoid problems
with Custom.

** UTF-16 coding systems are available, encoding the same characters
as mule-utf-8.  Coding system `utf-16-le-dos' is useful as the value
of `selection-coding-system' in MS Windows, allowing you to paste
multilingual text from the clipboard.  Set it interactively with
C-x RET x or in .emacs with `(set-selection-coding-system 'utf-16-le-dos)'.

** There is a new language environment for UTF-8 (set up automatically
in UTF-8 locales).

** Translation tables are available between equivalent characters in
different Emacs charsets -- for instance `e with acute' coming from the
Latin-1 and Latin-2 charsets.  User options `unify-8859-on-encoding-mode'
and `unify-8859-on-decoding-mode' respectively turn on translation
between ISO 8859 character sets (`unification') on encoding
(e.g. writing a file) and decoding (e.g. reading a file).  Note that
`unify-8859-on-encoding-mode' is useful and safe, but
`unify-8859-on-decoding-mode' can cause text to change when you read
it and write it out again without edits, so it is not generally advisable.
By default `unify-8859-on-encoding-mode' is turned on.

** In Emacs running on the X window system, the default value of
`selection-coding-system' is now `compound-text-with-extensions'.

If you want the old behavior, set selection-coding-system to
compound-text, which may be significantly more efficient.  Using
compound-text-with-extensions seems to be necessary only for decoding
text from applications under XFree86 4.2, whose behaviour is actually
contrary to the compound text specification.


* Installation changes in Emacs 21.2

** Support for BSD/OS 5.0 has been added.

** Support for AIX 5.1 was added.


* Changes in Emacs 21.2

** Emacs now supports compound-text extended segments in X selections.

X applications can use `extended segments' to encode characters in
compound text that belong to character sets which are not part of the
list of approved standard encodings for X, e.g. Big5.  To paste
selections with such characters into Emacs, use the new coding system
compound-text-with-extensions as the value of selection-coding-system.

** The default values of `tooltip-delay' and `tooltip-hide-delay'
were changed.

** On terminals whose erase-char is ^H (Backspace), Emacs
now uses normal-erase-is-backspace-mode.

** When the *scratch* buffer is recreated, its mode is set from
initial-major-mode, which normally is lisp-interaction-mode,
instead of using default-major-mode.

** The new option `Info-scroll-prefer-subnodes' causes Info to behave
like the stand-alone Info reader (from the GNU Texinfo package) as far
as motion between nodes and their subnodes is concerned.  If it is t
(the default), Emacs behaves as before when you type SPC in a menu: it
visits the subnode pointed to by the first menu entry.  If this option
is nil, SPC scrolls to the end of the current node, and only then goes
to the first menu item, like the stand-alone reader does.

This change was already in Emacs 21.1, but wasn't advertised in the
NEWS.


* Lisp Changes in Emacs 21.2

** The meanings of scroll-up-aggressively and scroll-down-aggressively
have been interchanged, so that the former now controls scrolling up,
and the latter now controls scrolling down.

** The variable `compilation-parse-errors-filename-function' can
be used to transform filenames found in compilation output.


* Installation Changes in Emacs 21.1

See the INSTALL file for information on installing extra libraries and
fonts to take advantage of the new graphical features and extra
charsets in this release.

** Support for GNU/Linux on IA64 machines has been added.

** Support for LynxOS has been added.

** There are new configure options associated with the support for
images and toolkit scrollbars.  Use the --help option in `configure'
to list them.

** You can build a 64-bit Emacs for SPARC/Solaris systems which
support 64-bit executables and also on Irix 6.5.  This increases the
maximum buffer size.  See etc/MACHINES for instructions.  Changes to
build on other 64-bit systems should be straightforward modulo any
necessary changes to unexec.

** There is a new configure option `--disable-largefile' to omit
Unix-98-style support for large files if that is available.

** There is a new configure option `--without-xim' that instructs
Emacs to not use X Input Methods (XIM), if these are available.

** `movemail' defaults to supporting POP.  You can turn this off using
the --without-pop configure option, should that be necessary.

** This version can be built for the Macintosh, but does not implement
all of the new display features described below.  The port currently
lacks unexec, asynchronous processes, and networking support.  See the
"Emacs and the Mac OS" appendix in the Emacs manual, for the
description of aspects specific to the Mac.

** Note that the MS-Windows port does not yet implement various of the
new display features described below.


* Changes in Emacs 21.1

** Emacs has a new redisplay engine.

The new redisplay handles characters of variable width and height.
Italic text can be used without redisplay problems.  Fonts containing
oversized characters, i.e. characters larger than the logical height
of a font can be used.  Images of various formats can be displayed in
the text.

** Emacs has a new face implementation.

The new faces no longer fundamentally use X font names to specify the
font.  Instead, each face has several independent attributes--family,
height, width, weight and slant--that it may or may not specify.
These attributes can be merged from various faces, and then together
specify a font.

Faces are supported on terminals that can display color or fonts.
These terminal capabilities are auto-detected.  Details can be found
under Lisp changes, below.

** Emacs can display faces on TTY frames.

Emacs automatically detects terminals that are able to display colors.
Faces with a weight greater than normal are displayed extra-bright, if
the terminal supports it.  Faces with a weight less than normal and
italic faces are displayed dimmed, if the terminal supports it.
Underlined faces are displayed underlined if possible.  Other face
attributes such as `overline', `strike-through', and `box' are ignored
on terminals.

The command-line options `-fg COLOR', `-bg COLOR', and `-rv' are now
supported on character terminals.

Emacs automatically remaps all X-style color specifications to one of
the colors supported by the terminal.  This means you could have the
same color customizations that work both on a windowed display and on
a TTY or when Emacs is invoked with the -nw option.

** New default font is Courier 12pt under X.

** Sound support

Emacs supports playing sound files on GNU/Linux and FreeBSD (Voxware
driver and native BSD driver, a.k.a. Luigi's driver).  Currently
supported file formats are RIFF-WAVE (*.wav) and Sun Audio (*.au).
You must configure Emacs with the option `--with-sound=yes' to enable
sound support.

** Emacs now resizes mini-windows if appropriate.

If a message is longer than one line, or minibuffer contents are
longer than one line, Emacs can resize the minibuffer window unless it
is on a frame of its own.  You can control resizing and the maximum
minibuffer window size by setting the following variables:

- User option: max-mini-window-height

Maximum height for resizing mini-windows.  If a float, it specifies a
fraction of the mini-window frame's height.  If an integer, it
specifies a number of lines.

Default is 0.25.

- User option: resize-mini-windows

How to resize mini-windows.  If nil, don't resize.  If t, always
resize to fit the size of the text.  If `grow-only', let mini-windows
grow only, until they become empty, at which point they are shrunk
again.

Default is `grow-only'.

** LessTif support.

Emacs now runs with the LessTif toolkit (see
<http://www.lesstif.org>).  You will need version 0.92.26, or later.

** LessTif/Motif file selection dialog.

When Emacs is configured to use LessTif or Motif, reading a file name
from a menu will pop up a file selection dialog if `use-dialog-box' is
non-nil.

** File selection dialog on MS-Windows is supported.

When a file is visited by clicking File->Open, the MS-Windows version
now pops up a standard file selection dialog where you can select a
file to visit.  File->Save As also pops up that dialog.

** Toolkit scroll bars.

Emacs now uses toolkit scroll bars if available.  When configured for
LessTif/Motif, it will use that toolkit's scroll bar.  Otherwise, when
configured for Lucid and Athena widgets, it will use the Xaw3d scroll
bar if Xaw3d is available.  You can turn off the use of toolkit scroll
bars by specifying `--with-toolkit-scroll-bars=no' when configuring
Emacs.

When you encounter problems with the Xaw3d scroll bar, watch out how
Xaw3d is compiled on your system.  If the Makefile generated from
Xaw3d's Imakefile contains a `-DNARROWPROTO' compiler option, and your
Emacs system configuration file `s/your-system.h' does not contain a
define for NARROWPROTO, you might consider adding it.  Take
`s/freebsd.h' as an example.

Alternatively, if you don't have access to the Xaw3d source code, take
a look at your system's imake configuration file, for example in the
directory `/usr/X11R6/lib/X11/config' (paths are different on
different systems).  You will find files `*.cf' there.  If your
system's cf-file contains a line like `#define NeedWidePrototypes NO',
add a `#define NARROWPROTO' to your Emacs system configuration file.

The reason for this is that one Xaw3d function uses `double' or
`float' function parameters depending on the setting of NARROWPROTO.
This is not a problem when Imakefiles are used because each system's
imake configuration file contains the necessary information.  Since
Emacs doesn't use imake, this has do be done manually.

** Tool bar support.

Emacs supports a tool bar at the top of a frame under X.  For details
of how to define a tool bar, see the page describing Lisp-level
changes.  Tool-bar global minor mode controls whether or not it is
displayed and is on by default.  The appearance of the bar is improved
if Emacs has been built with XPM image support.  Otherwise monochrome
icons will be used.

To make the tool bar more useful, we need contributions of extra icons
for specific modes (with copyright assignments).  Contributions would
also be useful to touch up some of the PBM icons manually.

** Tooltips.

Tooltips are small X windows displaying a help string at the current
mouse position.  The Lisp package `tooltip' implements them.  You can
turn them off via the user option `tooltip-mode'.

Tooltips also provides support for GUD debugging.  If activated,
variable values can be displayed in tooltips by pointing at them with
the mouse in source buffers.  You can customize various aspects of the
tooltip display in the group `tooltip'.

** Automatic Hscrolling

Horizontal scrolling now happens automatically if
`automatic-hscrolling' is set (the default).  This setting can be
customized.

If a window is scrolled horizontally with set-window-hscroll, or
scroll-left/scroll-right (C-x <, C-x >), this serves as a lower bound
for automatic horizontal scrolling.  Automatic scrolling will scroll
the text more to the left if necessary, but won't scroll the text more
to the right than the column set with set-window-hscroll etc.

** When using a windowing terminal, each Emacs window now has a cursor
of its own.  By default, when a window is selected, the cursor is
solid; otherwise, it is hollow.  The user-option
`cursor-in-non-selected-windows' controls how to display the
cursor in non-selected windows.  If nil, no cursor is shown, if
non-nil a hollow box cursor is shown.

** Fringes to the left and right of windows are used to display
truncation marks, continuation marks, overlay arrows and alike.  The
foreground, background, and stipple of these areas can be changed by
customizing face `fringe'.

** The mode line under X is now drawn with shadows by default.
You can change its appearance by modifying the face `mode-line'.
In particular, setting the `:box' attribute to nil turns off the 3D
appearance of the mode line.  (The 3D appearance makes the mode line
occupy more space, and thus might cause the first or the last line of
the window to be partially obscured.)

The variable `mode-line-inverse-video', which was used in older