annotate man/xemacs/undo.texi @ 793:e38acbeb1cae
[xemacs-hg @ 2002-03-29 04:46:17 by ben]
lots o' fixes
etc/ChangeLog: New file.
Separated out all entries for etc/ into their own ChangeLog.
Includes entries for the following files:
etc/BABYL, etc/BETA, etc/CHARSETS, etc/DISTRIB, etc/Emacs.ad,
etc/FTP, etc/GNUS-NEWS, etc/GOATS, etc/HELLO, etc/INSTALL,
etc/MACHINES, etc/MAILINGLISTS, etc/MSDOS, etc/MYTHOLOGY, etc/NEWS,
etc/OXYMORONS, etc/PACKAGES, etc/README, etc/TUTORIAL,
etc/TUTORIAL.de, etc/TUTORIAL.ja, etc/TUTORIAL.ko, etc/TUTORIAL.se,
etc/aliases.ksh, etc/altrasoft-logo.xpm, etc/check_cygwin_setup.sh,
etc/custom/example-themes/europe-theme.el,
etc/custom/example-themes/ex-custom-file,
etc/custom/example-themes/example-theme.el, etc/e/eterm.ti,
etc/edt-user.doc, etc/enriched.doc, etc/etags.1, etc/gnuserv.1,
etc/gnuserv.README, etc/package-index.LATEST.gpg,
etc/package-index.LATEST.pgp, etc/photos/jan.png, etc/recycle.xpm,
etc/refcard.tex, etc/sample.Xdefaults, etc/sample.emacs,
etc/sgml/CATALOG, etc/sgml/HTML32.dtd, etc/skk/SKK.tut.E,
etc/smilies/Face_ase.xbm, etc/smilies/Face_ase2.xbm,
etc/smilies/Face_ase3.xbm, etc/smilies/Face_smile.xbm,
etc/smilies/Face_weep.xbm, etc/sounds, etc/toolbar,
etc/toolbar/workshop-cap-up.xpm, etc/xemacs-ja.1, etc/xemacs.1,
etc/yow.lines, etc\BETA, etc\NEWS, etc\README, etc\TUTORIAL,
etc\TUTORIAL.de, etc\check_cygwin_setup.sh, etc\sample.init.el,
etc\unicode\README, etc\unicode\mule-ucs\*, etc\unicode\other\*
unicode/unicode-consortium/8859-16.TXT: New file.
mule/english.el: Define this charset now, since a bug was fixed that formerly
prevented it.
mule/ethio-util.el: Fix compile errors involving Unicode `characters', which should be
integers.
Makefile.in.in: Always include gui.c, to fix compile error when TTY-only.
EmacsFrame.c, abbrev.c, alloc.c, buffer.c, buffer.h, bytecode.c, bytecode.h, callint.c, callproc.c, casetab.c, casetab.h, charset.h, chartab.c, chartab.h, cmds.c, console-msw.c, console-msw.h, console-tty.c, console-x.c, console-x.h, console.c, console.h, data.c, database.c, device-gtk.c, device-msw.c, device-x.c, device.c, device.h, dialog-msw.c, doc.c, doprnt.c, dumper.c, dynarr.c, editfns.c, eldap.c, eldap.h, elhash.c, elhash.h, emacs.c, eval.c, event-Xt.c, event-gtk.c, event-msw.c, event-stream.c, event-tty.c, event-unixoid.c, events.c, events.h, extents.c, extents.h, faces.c, faces.h, file-coding.c, file-coding.h, fileio.c, filelock.c, fns.c, frame-gtk.c, frame-msw.c, frame-tty.c, frame-x.c, frame.c, frame.h, free-hook.c, general-slots.h, glyphs-eimage.c, glyphs-gtk.c, glyphs-msw.c, glyphs-widget.c, glyphs-x.c, glyphs.c, glyphs.h, gpmevent.c, gtk-xemacs.c, gui-msw.c, gui-x.c, gui-x.h, gui.c, gui.h, gutter.c, gutter.h, indent.c, input-method-xlib.c, insdel.c, keymap.c, keymap.h, lisp-disunion.h, lisp-union.h, lisp.h, lread.c, lrecord.h, lstream.c, lstream.h, marker.c, menubar-gtk.c, menubar-msw.c, menubar-x.c, menubar.c, minibuf.c, mule-canna.c, mule-ccl.c, mule-charset.c, mule-wnnfns.c, native-gtk-toolbar.c, objects-msw.c, objects-tty.c, objects-x.c, objects.c, objects.h, opaque.c, opaque.h, postgresql.c, postgresql.h, print.c, process-unix.c, process.c, process.h, rangetab.c, rangetab.h, redisplay-gtk.c, redisplay-msw.c, redisplay-output.c, redisplay-tty.c, redisplay-x.c, redisplay.c, scrollbar-gtk.c, scrollbar-msw.c, scrollbar-x.c, scrollbar.c, scrollbar.h, search.c, select-gtk.c, select-x.c, sound.c, specifier.c, specifier.h, strftime.c, symbols.c, symeval.h, syntax.h, text.c, text.h, toolbar-common.c, toolbar-msw.c, toolbar.c, toolbar.h, tooltalk.c, tooltalk.h, ui-gtk.c, ui-gtk.h, undo.c, vm-limit.c, window.c, window.h: Eliminate XSETFOO. Replace all usages with wrap_foo().
Make symbol->name a Lisp_Object, not Lisp_String *. Eliminate
nearly all uses of Lisp_String * in favor of Lisp_Object, and
correct macros so most of them favor Lisp_Object.
Create new error-behavior ERROR_ME_DEBUG_WARN -- output warnings,
but at level `debug' (usually ignored). Use it when instantiating
specifiers, so problems can be debugged. Move
log-warning-minimum-level into C so that we can optimize
ERROR_ME_DEBUG_WARN.
Fix warning levels consistent with new definitions.
Add default_ and parent fields to char table; not yet implemented.
New fun Dynarr_verify(); use for further error checking on Dynarrs.
Rearrange code at top of lisp.h in conjunction with dynarr changes.
Fix eifree(). Use Eistrings in various places
(format_event_object(), where_is_to_char(), and callers thereof)
to avoid fixed-size strings buffers. New fun write_eistring().
Reindent and fix GPM code to follow standards.
Set default MS Windows font to Lucida Console (same size as
Courier New but less interline spacing, so more lines fit).
Increase default frame size on Windows to 50 lines. (If that's too
big for the workspace, the frame will be shrunk as necessary.)
Fix problem with text files with no newlines (). (Change
`convert-eol' coding system to use `nil' for autodetect,
consistent with make-coding-system.)
Correct compile warnings in vm-limit.c.
Fix handling of reverse-direction charsets to avoid errors when
opening (e.g.) mule-ucs/lisp/reldata/uiso8859-6.el.
Recode some object printing methods to use write_fmt_string()
instead of a fixed buffer and sprintf.
Turn on display of png comments as warnings (level `info'), now
that they're unobtrusive.
Revamped the sound documentation.
Fixed bug in redisplay w.r.t. hscroll/truncation/continuation
glyphs causing jumping up and down of the lines, since they're
bigger than the line size. (It was seen most obviously when
there's a horizontal scroll bar, e.g. do C-h a glyph or something
like that.) The problem was that the glyph-contrib-p setting on
glyphs was ignored even if it was set properly, which it wasn't
until now.
| author |
ben |
| date |
Fri, 29 Mar 2002 04:49:13 +0000 |
| parents |
376386a54a3c |
| children |
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| rev |
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1
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2 @node Undo, Minibuffer, Basic, Top
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3 @chapter Undoing Changes
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4 @cindex undo
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5 @cindex mistakes, correcting
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6
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7 Emacs allows you to undo all changes you make to the text of a buffer,
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8 up to a certain amount of change (8000 characters). Each buffer records
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9 changes individually, and the undo command always applies to the
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10 current buffer. Usually each editing command makes a separate entry
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11 in the undo records, but some commands such as @code{query-replace}
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12 make many entries, and very simple commands such as self-inserting
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13 characters are often grouped to make undoing less tedious.
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14
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15 @table @kbd
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16 @item C-x u
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17 Undo one batch of changes (usually, one command's worth) (@code{undo}).
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18 @item C-_
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19 The same.
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20 @end table
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21
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22 @kindex C-x u
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23 @kindex C-_
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24 @findex undo
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25 The command @kbd{C-x u} or @kbd{C-_} allows you to undo changes. The
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26 first time you give this command, it undoes the last change. Point
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27 moves to the text affected by the undo, so you can see what was undone.
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28
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29 Consecutive repetitions of the @kbd{C-_} or @kbd{C-x u} commands undo
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30 earlier and earlier changes, back to the limit of what has been
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31 recorded. If all recorded changes have already been undone, the undo
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32 command prints an error message and does nothing.
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33
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34 Any command other than an undo command breaks the sequence of undo
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35 commands. Starting at this moment, the previous undo commands are
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36 considered ordinary changes that can themselves be undone. Thus, you can
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37 redo changes you have undone by typing @kbd{C-f} or any other command
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38 that have no important effect, and then using more undo commands.
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39
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40 If you notice that a buffer has been modified accidentally, the
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41 easiest way to recover is to type @kbd{C-_} repeatedly until the stars
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42 disappear from the front of the mode line. When that happens, all the
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43 modifications you made have been canceled. If you do not remember
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44 whether you changed the buffer deliberately, type @kbd{C-_} once. When
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45 you see Emacs undo the last change you made, you probably remember why you
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46 made it. If the change was an accident, leave it undone. If it was
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47 deliberate, redo the change as described in the preceding paragraph.
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48
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49 Whenever an undo command makes the stars disappear from the mode line,
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50 the buffer contents is the same as it was when the file was last read in
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51 or saved.
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52
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53 Not all buffers record undo information. Buffers whose names start with
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54 spaces don't; these buffers are used internally by Emacs and its extensions
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55 to hold text that users don't normally look at or edit. Minibuffers,
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56 help buffers, and documentation buffers also don't record undo information.
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57
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58 Emacs can remember at most 8000 or so characters of deleted or
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59 modified text in any one buffer for reinsertion by the undo command.
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60 There is also a limit on the number of individual insert, delete, or
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61 change actions that Emacs can remember.
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62
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63 There are two keys to run the @code{undo} command, @kbd{C-x u} and
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64 @kbd{C-_}, because on some keyboards, it is not obvious how to type
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65 @kbd{C-_}. @kbd{C-x u} is an alternative you can type in the same
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66 fashion on any terminal.
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