6 This file presents some general information about XEmacs. It is
7 primarily about the changes in recent XEmacs versions and its release
10 Use `C-c C-f' to move to the next equal level of outline, and
11 `C-c C-b' to move to previous equal level. `C-h m' will give more
12 info about the Outline mode. Many commands are also available through
15 Users who would like to know which capabilities have been introduced
16 in each release should look at the appropriate section of this file.
17 Starting with version 20.0, XEmacs includes ChangeLogs, which can be
18 consulted for a more detailed list of changes.
20 Users interested in some of the details of how XEmacs differs from GNU
21 Emacs should read the section "What's Different?" near the end of this
24 N.B. The term "GNU Emacs" refers to any release of Emacs Version
25 19 from the Free Software Foundation's GNU Project. (We do not
26 say just "Emacs" as Richard M. Stallman ["RMS"] prefers, because
27 it is clearly a more generic term.) The term "XEmacs" refers to
28 this program or to its predecessors "Era" and "Lucid Emacs". The
29 predecessor of all these program is called "Emacs 18". When no
30 particular version is implied, "Emacs" will be used.
33 * Changes in XEmacs 21.2
34 ========================
36 ** `delete-key-deletes-forward' now defaults to t.
38 `delete-key-deletes-forward' is the variable that regulates the
39 behaviour of the delete key on the systems that offer both a backspace
40 and a delete key. If set to nil, the key labeled "Delete" will delete
41 backward. If set to non-nil, the "Delete" key will delete forward,
42 except on keyboards where a "Backspace" key is not provided.
44 Unless our implementation has bugs, the only reason why you would want
45 to set `delete-key-deletes-forward' to nil is if you want to use the
46 Delete key to delete backwards, despite the presence (according to
47 Xlib) of a BackSpace key on the keyboard.
49 ** Interactive searching and matching case improvements.
51 Case sensitiveness in searching operations is normally controlled by
52 the variable `case-fold-search' (if non-nil, case is ignored while
53 searching). This mechanism has now been slightly improved for
54 interactive searches: if the search string (or regexp) contains
55 uppercase characters, the searching is forced to be case-sensitive,
58 The new behavior affects all functions performing interactive
59 searches, like `zap-to-char', `list-matching-lines', `tags-search'
60 etc. The incremental search facility has always behaved that way.
62 ** You can now create "indirect buffers", like in GNU Emacs. An
63 indirect buffer shares its text with another buffer ("base buffer"),
64 but has its own major mode, local variables, extents, and narrowing.
65 An indirect buffer has a name of its own, distinct from those of the
66 base buffer and all other buffers. An indirect buffer cannot itself
67 be visiting a file (though its base buffer can be). The base buffer
68 cannot itself be indirect.
70 Use (make-indirect-buffer BASE-BUFFER NAME) to make an indirect buffer
71 named NAME whose base is BASE-BUFFER. If BASE-BUFFER is itself an
72 indirect buffer, its base buffer is used as the base for the new
75 You can make an indirect buffer current, or switch to it in a window,
76 just as you would a non-indirect buffer.
78 The function `buffer-base-buffer' returns a buffer's base buffer or
79 nil, if given an ordinary (non-indirect) buffer. The function
80 `buffer-indirect-children' returns a list of the indirect children of
83 ** User names following the tilde character can now be completed at
84 file name prompts; e.g. `C-x C-f ~hni<TAB>' will complete to
85 `~hniksic/'. To make this operation faster, a cache of user names is
86 maintained internally.
88 The new primitives available for this purpose are functions named
89 `user-name-completion' and `user-name-all-completions'.
92 * Lisp and internal changes in XEmacs 21.2
93 ==========================================
95 ** Much effort has been invested to make XEmacs Lisp faster:
97 *** Many basic lisp operations are now faster.
98 This is especially the case when running a Mule-enabled XEmacs.
100 A general overhaul of the lisp engine should produce a speedup of 1.4
101 in a Latin-1 XEmacs, and 2.1 in a Mule XEmacs. These numbers were
102 obtained running `(byte-compile "simple.el")', which should be a
103 pretty typical test of "pure" Lisp.
105 *** Lisp hash tables have been re-implemented. The Common Lisp style
106 hash table interface has been made standard, and moved from cl.el into
107 fast C code (See the section on hash tables in the XEmacs Lisp
108 Reference). A speedup factor of 3 can be expected with code that
109 makes intensive use of hash tables.
111 *** The garbage collector has been tuned, leading to a speedup of
114 *** The family of functions that iterate over lists, like `memq', and
115 `rassq', have been made a little faster (typically 1.3).
117 *** Lisp function calls are faster, by approximately a factor of two.
118 However, defining inline functions (via defsubst) still makes sense
121 *** Finally, a few functions have had dramatic performance
122 improvements. For example, `(last long-list)' is now 30 times faster.
124 Of course, your mileage will vary.
126 Many operations do not see any improvement. Surprisingly, running
127 (font-lock-fontify-buffer) does not use the Lisp engine much at all.
128 Speeding up your favorite slow operation is an excellent project to
129 improve XEmacs. Don't forget to profile!
131 ** XEmacs finally has an automated test suite!
132 Although this is not yet very sophisticated, it is already responsible
133 for several important bug fixes in XEmacs. To try it out, simply use
134 the makefile target `make check' after building XEmacs.
136 ** Hash tables have been reimplemented.
137 As was pointed out above, the standard interface to hash tables is now
138 the Common Lisp interface, as described in Common Lisp, the Language
139 (CLtL2, by Steele). The older interface (functions with names
140 containing the phrase `hashtable') will continue to work, but the
141 preferred interface now has names containing the phrase `hash-table'.
143 Here's the executive overview: create hash tables using
144 make-hash-table, and use gethash, puthash, remhash, maphash and
145 clrhash to manipulate entries in the hash table. See the (updated)
146 Lisp Reference Manual for details.
148 ** Lisp code handles circular lists much more robustly.
149 Many basic lisp functions used to loop forever when given a circular
150 list, expecting you to C-g (quit) out of the loop. Now this is more
151 likely to trigger a `circular-list' error. Printing a circular list
152 now results in something like this:
154 (let ((x (cons 'foo 'foo)))
157 => (foo ... <circular list>)
159 An extra bonus is that checking for circularities is not just
160 friendlier, but actually faster than checking for C-g.
162 ** The new form `ignore-file-errors', similar to `ignore-errors' may
163 be used as a short-hand for condition-case when you wish to ignore
164 file-related error. For example:
166 (ignore-file-errors (delete-file "foo"))
168 ** The arguments to `locate-file' are now much more "lispy". As
169 before, the usage is:
171 (locate-file FILENAME PATH-LIST &optional SUFFIXES MODE)
173 Except that SUFFIXES are now a list of strings instead of a single,
174 colon-separated string. MODE is now a symbol or a list of symbols
175 (symbols `exists', `executable', `writable', and `readable' are
176 supported) instead of an integer code. See the documentation for
179 Of course, the old form is still accepted for backward compatibility.
181 ** `translate-region' has been improved in several ways. Its TABLE
182 argument used to be a 256-character string. In addition to this, it
183 can now also be a vector or a char-table (which is useful for Mule.)
184 If TABLE a vector or a generic char-table, you can map characters to
185 strings instead of to other characters. For instance:
187 (let ((table (make-char-table 'generic)))
188 (put-char-table ?a "the letter a" table)
189 (put-char-table ?b "" table)
190 (put-char-table ?c ?\n table)
191 (translate-region (point-min) (point-max) table))
193 ** The `keywordp' function now returns non-nil only on symbols
194 interned in the global obarray. For example:
196 (keywordp (intern ":foo" [0]))
198 (keywordp (intern ":foo")) ; The same as (keywordp :foo)
201 This behaviour is compatible with other code which treats symbols
202 beginning with colon as keywords only if they are interned in the
203 global obarray. `keywordp' used to wrongly return t in both cases
206 ** The first argument to `intern-soft' may now also be a symbol, like
207 with `unintern'. If given a symbol, `intern-soft' will look for that
208 exact symbol rather than for any string. This is useful when you want
209 to check whether a specific symbol is interned in an obarray, e.g.:
214 (intern-soft (make-symbol "foo"))
217 ** Functions for decoding base64 encoding are now available; see
218 `base64-encode-region', `base64-encode-string', `base64-decode-region'
219 and `base64-decode-string'.
222 * Changes in XEmacs 21.0
223 ========================
225 ** XEmacs has been unbundled into constituent installable packages.
226 See the Info documentation under "Packages" for more information.
227 See the file `etc/PACKAGES' in the distribution for a partial list of
228 packages available at the time of the 21.0 release.
230 ** XEmacs is now supported under Microsoft Windows 95/98 and Windows
231 NT operating systems. For starters, look at the XEmacs on Windows FAQ
232 at <URL:http://jagor.srce.hr/~hniksic/xemacs-on-windows-faq.txt>. To
233 discuss Windows-specific issues, subscribe to the mailing list at
234 <xemacs-nt-request@xemacs.org>.
236 ** XEmacs will now use `XEmacs' as its application class if it finds
237 any `XEmacs' resources in the resource database. Otherwise, it will
238 continue to use the `Emacs' class.
240 ** The options menu has been ported to Custom.
241 This means that each entry in the options menu acts as if you had customized
242 the corresponding variable by hand. ### WARNING: there is currently no
243 upgrading function to help you port your old options settings to the new
244 format. Consequently, if you want to modify the options for XEmacs 21, you
245 will have to set them all again through the menu, and remove the code loading
246 .xemacs-options from your .emacs.
248 ** When the Zmacs region is active, `M-x query-replace' and the other
249 replace commands now operate on the region contents only.
251 ** XEmacs now is able to choose X visuals and use private colormaps.
252 The '-visual <visualStr>' command line option or the '.EmacsVisual'
253 Xresource controls which visual XEmacs will use, and
254 '-privateColormap' or '.privateColormap' will force XEmacs to create a
255 private colormap for use. The syntax for the visual string is
256 "<visual><bitdepth>" where <visual> is one of 'StaticColor',
257 'TrueColor', 'GrayScale', 'PseudoColor' or 'DirectColor' and
258 <bitdepth> is the appropriate number of bits per pixel. If an invalid
259 or non-supported combination is entered, XEmacs attempts to find a happy
260 medium. The X creation mechanism will then determine if it needs to
261 create a colormap for use, or the presence of the private flags will
262 force it to create it.
264 ** The `imenu' package has been ported to XEmacs and is available as a
267 ** `echo-keystrokes' can now be a floating-point number, so that you
268 can set it to intervals shorter than one second.
270 (setq echo-keystrokes 0.1)
272 ** The new command `center-to-window-line' works like `recenter'
273 (bound to `C-l'), only it does not redisplay the whole display area.
275 ** The M-. command will now first search through exact tags matches,
276 and then through inexact matches, as one would expect.
278 ** The new variable `user-full-name' can be used to customize one's
279 name when using the Emacs mail and news reading facilities.
281 Normally, `user-full-name' is a function that returns the full name of
282 a user or UID, as specified by the system -- for instance,
283 (user-full-name "root") returns something like "Super-User". However,
284 when the function is called without arguments, it will return the
285 value of the `user-full-name' variable. The `user-full-name' variable
286 is initialized using the environment variable NAME and (failing that)
287 the user's system name.
289 The behavior of the `user-full-name' function with an argument
290 specified is unchanged.
292 ** The new command `M-x customize-changed-options' lets you customize
293 all the options whose default values have changed in recent Emacs
294 versions. You specify a previous Emacs version number as argument,
295 and the command creates a customization buffer showing all the
296 customizable options whose default values were changed since that
299 If you don't specify a particular version number argument, then the
300 customization buffer shows all the customizable options for which
301 Emacs versions of changes are recorded.
303 ** The new command `add-log-convert' can be used to convert the
304 old-style (pre-20.3) ChangeLog buffers to new style, for
305 consistency. A reminder: if you wish to revert to old-style
306 ChangeLogs instead, customize the value of `add-log-time-format'
309 ** The new command `zap-up-to-char' is now available. It is similar
310 to `zap-to-char', except that it does not delete the searched-for
311 character. It is not bound to a key by default.
313 ** You can now store a number into a register with `C-u NUMBER C-x r n'
314 REG, increment it by INC with `C-u INC C-x r + REG' (to increment by
315 one, omit C-u INC), and insert it in the buffer with `C-x r g REG'.
316 This is useful for writing keyboard macros.
318 ** The M-: command, when given a prefix argument, will now insert its
319 result to the current buffer.
321 ** The `C-h c' command, when given a prefix argument, will now insert
322 the message into the current buffer.
324 ** Horizontally split windows may now be dragged using the mouse.
325 Because of this, the dividers between vertical windows are always
326 visible. To turn it off, set `vertical-divider-always-visible-p' to
329 ** XEmacs/Mule (internationalization) changes.
331 *** Mule support now works on TTY's. Use `set-terminal-coding-system'
332 and `set-keyboard-coding-system' to specify the coding system of your
333 display and keyboard.
335 *** Egg/SJ3 input method is now officially supported. Quail and
336 Egg/Skk have been available through the generalized Leim since 20.3.
338 *** Localized Japanese menubars are available if XEmacs is built with
339 XFONTSET and either the X11 libraries are built with X_LOCALE defined
340 or the native C libraries support Japanese localization. This has
341 been available since 20.3, only it hasn't been announced before.
343 ** Jamie Zawinski's `gdb-highlight' extension is now distributed with
344 the `debug' package. gdb-highlight makes most objects printed in a
345 gdb buffer be mouse-sensitive: as text shows up in the buffer, it is
346 parsed, and objects which are recognized have context-sensitive
347 commands attached to them. To use it, add the following to `.emacs':
349 (add-hook 'gdb-mode-hook (lambda () (require 'gdb-highlight)))
351 ** The package popper.el is now included in the edit-utils package.
352 It has been greatly enhanced with respect to the one once included
353 with the ilisp package and should work well under XEmacs 21.0.
357 *** Like the old 'gnudoit' program. Gnuclient -batch now can read from stdin.
359 *** Gnuclient -batch no longer breaks off the output at the first LF.
363 *** Multiline macros are now handled, both as they affect indentation,
364 and as recognized syntax. New syntactic symbol cpp-macro-cont is
365 assigned to second and subsequent lines of a multiline macro
368 *** A new style "user" which captures all non-hook-ified
369 (i.e. top-level) .emacs file variable setings and customizations.
370 Style "cc-mode" is an alias for "user" and is deprecated. "gnu" style
371 is still the default however.
373 *** "java" style now conforms to Sun's JDK coding style.
375 *** There are new commands c-beginning-of-defun, c-end-of-defun which
376 are alternatives which you could bind to C-M-a and C-M-e if you prefer
377 them. They do not have key bindings by default.
379 *** New and improved implementations of M-a (c-beginning-of-statement)
380 and M-e (c-end-of-statement).
382 *** C++ namespace blocks are supported, with new syntactic symbols
383 namespace-open, namespace-close, and innamespace.
385 *** File local variable settings of c-file-style and c-file-offsets
386 makes the style variables local to that buffer only.
388 *** New indentation functions c-lineup-close-paren,
389 c-indent-one-line-block, c-lineup-dont-change.
391 *** Improvements (hopefully!) to the way CC Mode is loaded. You
392 should now be able to do a (require 'cc-mode) to get the entire
393 package loaded properly for customization in your .emacs file. A new
394 variable c-initialize-on-load controls this and is t by default.
396 ** In Text mode, now only blank lines separate paragraphs.
397 This makes it possible to get the full benefit of Adaptive Fill mode
398 in Text mode, and other modes derived from it (such as Mail mode).
399 TAB in Text mode now runs the command indent-relative; this makes a
400 practical difference only when you use indented paragraphs.
402 As a result, the old Indented Text mode is now identical to Text mode,
403 and is an alias for it.
405 If you want spaces at the beginning of a line to start a paragraph,
406 use the new mode, Paragraph Indent Text mode.
408 ** Changes to Gnus, the XEmacs newsreader.
410 *** New functionality for using Gnus as an offline newsreader has been
411 added. A plethora of new commands and modes have been added. See the
412 Gnus manual for the full story.
414 *** The nndraft backend has returned, but works differently than
415 before. All Message buffers are now also articles in the nndraft
416 group, which is created automatically.
418 *** `gnus-alter-header-function' can now be used to alter header
421 *** `gnus-summary-goto-article' now accept Message-ID's.
423 *** A new Message command for deleting text in the body of a message
424 outside the region: `C-c C-v'.
426 *** You can now post to component group in nnvirtual groups with
429 *** `nntp-rlogin-program' -- new variable to ease customization.
431 *** `C-u C-c C-c' in `gnus-article-edit-mode' will now inhibit
432 re-highlighting of the article buffer.
434 *** New element in `gnus-boring-article-headers' -- `long-to'.
436 *** `M-i' symbolic prefix command. See the section "Symbolic
437 Prefixes" in the Gnus manual for details.
439 *** `L' and `I' in the summary buffer now take the symbolic prefix
440 `a' to add the score rule to the "all.SCORE" file.
442 *** `gnus-simplify-subject-functions' variable to allow greater
443 control over simplification.
445 *** `A T' -- new command for fetching the current thread.
447 *** `/ T' -- new command for including the current thread in the
450 *** `M-RET' is a new Message command for breaking cited text.
452 *** \\1-expressions are now valid in `nnmail-split-methods'.
454 *** The `custom-face-lookup' function has been removed.
455 If you used this function in your initialization files, you must
456 rewrite them to use `face-spec-set' instead.
458 *** Cancelling now uses the current select method. Symbolic prefix
459 `a' forces normal posting method.
461 *** New command to translate M******** sm*rtq**t*s into proper text
464 *** For easier debugging of nntp, you can set `nntp-record-commands'
467 *** nntp now uses ~/.authinfo, a .netrc-like file, for controlling
468 where and how to send AUTHINFO to NNTP servers.
470 *** A command for editing group parameters from the summary buffer
473 *** A history of where mails have been split is available.
475 *** A new article date command has been added -- `article-date-iso8601'.
477 *** Subjects can be simplified when threading by setting
478 `gnus-score-thread-simplify'.
480 *** A new function for citing in Message has been added --
481 `message-cite-original-without-signature'.
483 *** `article-strip-all-blank-lines' -- new article command.
485 *** A new Message command to kill to the end of the article has
488 *** A minimum adaptive score can be specified by using the
489 `gnus-adaptive-word-minimum' variable.
491 *** The "lapsed date" article header can be kept continually
492 updated by the `gnus-start-date-timer' command.
494 *** Web listserv archives can be read with the nnlistserv backend.
496 *** Old dejanews archives can now be read by nnweb.
498 *** Byte-compilation of user-specs now works under XEmacs.
500 ** The `dir' files are no longer essential for functioning of the Info
501 subsystem. If the `dir' file does not exist in an Info directory, the
502 relevant information will be generated on-the-fly.
504 This behavior can be customized, look for `Info-auto-generate-directory'
505 and `Info-save-auto-generated-dir' in the `info' customization group.
508 * Lisp and internal changes in XEmacs 21.0
509 ==========================================
511 ** It is now possible to build XEmacs with support for 31-bit Lisp
512 integers (normally, Lisp integers are only 28 bits wide on 32-bit
513 machines.) Configure with --use-minimal-tagbits to test. With this
514 change, the maximum buffer size on 32-bit machines is increased from
515 128M to 1G. This setting will be made default in a future XEmacs
518 ** Specifier changes.
520 *** When instantiating a specifier, the window locale now has a higher
521 precedence than the buffer locale. This is because the window locale
522 is more specific than the buffer locale.
524 *** The new macro `let-specifier' can be used to temporarily add
525 specifications to specifiers. See the documentation for details.
527 *** The new specifiers `vertical-scrollbar-visible-p' and
528 `horizontal-scrollbar-visible-p' may be used to control scrollbar
529 visibility. Previously, the only way to remove a scrollbar was to set
530 its size to 0. This method is still supported for backward
533 *** The new specifiers `scrollbar-on-left-p' and `scrollbar-on-top-p'
534 may be used to control the position of the vertical and horizontal
535 toolbar. Previously, their position could be changed only through the
538 *** The new draggable vertical dividers between windows may be turned
539 off using the `vertical-divider-always-visible-p' specifier. When
540 this is set to nil, the vertical dividers between windows are shown
541 only when needed, and they are not draggable.
543 Other properties of the vertical dividers may be controlled using
544 `vertical-divider-shadow-thickness', `vertical-divider-line-width' and
545 `vertical-divider-spacing' specifiers, which see.
547 ** Frame focus management changes.
549 *** When the variable focus-follows-mouse is non-nil, `select-frame'
550 no longer permanently selects a different frame. The frame selection
551 is temporary and is reverted when the current command terminates, much
552 like the buffer selected by `set-buffer'. This is the same as in FSF
555 *** The new function `focus-frame' sets the window system focus to
556 FRAME (and selects it), regardless of the value of
557 `focus-follows-mouse'. Doing this is not well behaved, so be
558 absolutely sure that you want this.
560 The code that uses `select-frame' only to get the window manager focus
561 should be changed to use `set-frame-focus' instead, so that they keep
562 working when `focus-follows-mouse' is non-nil.
564 *** The special forms `save-selected-frame' and `with-selected-frame'
565 can now be used to temporarily change selected frame.
567 *** The behavior of `other-frame' command (`C-x 5 o') is unaffected by
570 ** The function `select-window' now has an optional second argument
571 NORECORD which if non-nil inhibits the recording of a buffer change.
573 ** The function `vertical-motion' now correctly handles the second,
574 optional WINDOW argument. A new third argument PIXELS, if non-nil,
575 indicates that the returned motion should be in pixels.
577 ** The new function `vertical-motion-pixels' is similar to
578 vertical-motion but takes as input a vertical motion in pixels.
580 ** The new functions window-text-area-pixel-{width,height,edges} can
581 be used to obtain information about the text-displaying area of a
584 ** The new functions `shrink-window-pixels' and `enlarge-window-pixels'
585 can be used to adjust the size of a window by a pixel amount.
587 ** The new function `window-displayed-text-pixel-height' can be used
588 to determine the height of the text actually displayed in a window.
590 ** The arithmetic comparison functions <, >, =, /= now accept a
591 variable number of arguments.
593 This means that if you want to test whether A < B < C, you can write
594 it as (< A B C) instead of (and (< A B) (< B C)). Likewise,
595 (apply #'> LIST) now tests if LIST is monotonously increasing -- and
598 ** The XEmacs hashtables now have a consistent read/print syntax.
599 This means that a hashtable will be readably printed in a
602 #s(hashtable size 2 data (key1 value1 key2 value2))
604 When XEmacs reads this form, it will create a new hashtable according
605 to description. This allows you to easily dump hashtables to files
606 using `prin1', and read them back in using `read'.
608 If `print-readably' is non-nil, a more relaxed syntax is used; for
611 #<hashtable size 2/13 data (key1 value1 key2 value2) 0x874d>
613 ** It is now possible to build XEmacs with LDAP support.
614 You will need to install a LDAP library first. The following have
616 - LDAP 3.3 from the University of Michigan
617 (get it from <URL:http://www.umich.edu/~dirsvcs/ldap/>)
618 - OpenLDAP 1.0.3 from the OpenLDAP Foundation
619 (get it from <URL:http://www.openldap.org/>)
620 - LDAP SDK 1.0 from Netscape Corp.
621 (get it from <URL:http://developer.netscape.com/>)
623 ** When profiling is in effect, a call-count of all recorded functions
624 is now calculated. This information is stored in
625 `call-count-profile-table', and is utilized by `profile-results' as
626 well as the new command `profile-call-count-results'.
628 ** It is now an error to change the value of a symbol whose name
629 starts with a colon, if it is interned in the standard obarray.
631 However, setting such a symbol to its proper value, which is that
632 symbol itself, is not an error. This is for the sake of programs that
633 support pre-19.12 XEmacs and pre-20 GNU Emacs by explicitly setting
634 these variables to themselves.
636 ** The `concat' function no longer accepts integer arguments.
638 ** The new function `string' concatenates all its argument characters
639 and returns the resulting string. This is consistent with other
640 functions, like `list', `vector', etc.
642 ** The function `temp-directory' is now available to return the
643 directory to store temporary files. On Unix this will be obtained
644 from TMPDIR, defaulting to `/tmp'.
646 ** The function load-average now accepts an optional argument
647 USE-FLOATS. If it is non-nil, the load average values are returned as
648 floating point numbers, rather than as integers to be divided by 100.
650 ** The `make-event' function now supports the TYPE and PLIST
651 arguments, which can be used to create various events from Lisp. See
652 the documentation for details.
654 ** `function-interactive' is a new function that returns the
655 interactive specification of a funcallable object.
657 ** The new `lmessage' function allows printing of a formatted message
658 with a particular label.
660 (lmessage 'progress "Processing... %d" counter)
662 This function is more convenient than `display-message' because it
663 automatically applies `format' to its arguments.
665 ** The new `lwarn' function, analogous to `lmessage', allows printing
666 a formatted warning, with a non-default CLASS or LABEL.
668 ** The new function `split-path' can now be used to explode the
669 components of a colon-separated search path into a list.
671 (split-path "foo:bar")
674 ** Specifiers and symbols whose value is a specifier are now allowed
675 as modeline specifications.
677 ** defcustom now accepts the keyword `:version'. Use this to specify
678 in which version of Emacs a certain variable's default value changed.
681 (defcustom foo-max 34 "*Maximum number of foo's allowed."
686 This information is used to control the customize-changed-options
689 ** The line number tracking in modeline is now efficient, even for
690 very large buffers. This is achieved by caching the line numbers of
691 recent buffer positions, and reusing them. This cache is used only in
692 the buffers where `line-number-mode' is in effect.
694 ** When the new GNU Malloc aka Doug Lea Malloc is available, it will
695 be used. This should result in better performance on Linux systems
698 ** The code XEmacs uses to assemble its various paths into the
699 directory hierarchy has been rewritten to support the package system.
700 Look under "Startup Paths" in the Info documentation for more
703 *** site-lisp is now longer part of the load-path by default.
704 Its use is deprecated, but you can specify --with-site-lisp=yes at the
705 configure command line to get it back.
707 *** `Info-default-directory-list' is now obsolete. If you want to
708 change the path which XEmacs uses to search for info files, set
709 `Info-directory-list' instead.