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NEWS
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NEWS about less
======================================================================
For the latest news about less, see https://greenwoodsoftware.com/less
You can also download the latest version of less from there.
Report bugs, suggestions or comments at
https://github.com/gwsw/less/issues.
======================================================================
Major changes between "less" versions 668 and 673
* Treat -r in LESS environment variable as -R.
* Add ESC-j and ESC-k commands (github #560).
* Add --no-paste option (github #523).
* Add --no-edit-warn option (github #513).
* Add --form-feed option (github #496).
* Make TAB complete option name in -- command (github #531).
* Update the file size on an attempt to go past end of file.
* Make -R able to pass through any OSC escape sequences,
not just OSC 8 (github #504).
* Setting LESS_IS_MORE=0 now disables "more" compatibility even
if invoked via a file link named "more" (github #500).
* Pass through escape sequences in prompts even if -R is not set.
* Add LESS_SHELL_LINES to support shell prompts which use more than
one line (github #514).
* Add LESSANSIOSCALLOW to define OSC types which may be passed through.
* Add LESSANSIOSCCHARS to define non-standard OSC intro chars.
* Add LESS_SIGUSR1 to define user signal handler (github #582).
* Add mouse and mouse6 commands to lesskey (github #569).
* Fix unexpected behavior when entering a partial command followed by
a valid command (github #543).
* Fix bug when coloring prompt string with SGR sequences (github #516).
* Fix bug when searching for text near an invalid UTF-8 sequence (github #542).
* Fix display bug when file contains ESC followed by NUL (github #550).
* Fix bug when using +:n +:p +:x or +:d on the command line (github #552).
* Fix bug with --no-number-headers when header is not at start of file
(github #566).
* Fix bug where lesstest fails if window is resized (github #570).
* Fix bug using "configure --with-secure=no" (github #584).
* Fix bug using multibyte command chars (github #595).
* Fix auto_wrap setting on Windows (github #497).
* Fix two bugs using ^S search modifier (github #605).
* Fix bug searching for UTF-8 strings with the PCRE2 library (github #610).
======================================================================
Major changes between "less" versions 661 and 668
* Make 256/true colors work better on Windows without -Da
(github #539, github #546, github #562).
* Fix build using --with-secure (github #544).
* Fix crash when using --header on command line (github #545).
* Fix possible crash when scrolling left/right or toggling -S (github #547).
* Fix bug when using #stop in a lesskey file (github #551).
* Fix bug when using --shift or --match-shift on command line with
a parameter starting with '.' (github #554).
* Fix bug in R command when file size changes (github #553).
* Fix bug using --header when file does not fill screen (github #556).
* Fix ^X bug when output is not a terminal (github #558).
* Fix bug where ^Z is not handled immediately (github #563).
* Fix bug where first byte from a LESSOPEN filter is deleted if it is
greater than 0x7F (github #568).
* Fix uninitialized variable in edit_ifile (github #573).
* Fix incorrect handling of UTF-8 chars in prompts (github #576).
======================================================================
Major changes between "less" versions 643 and 661
* Add ^O^N, ^O^P, ^O^L and ^O^O commands and mouse clicks (with --mouse)
to find and open OSC8 hyperlinks (github #251).
* Add --match-shift option.
* Add --lesskey-content option (github #447).
* Add LESSKEY_CONTENT environment variable (github #447).
* Add --no-search-header-lines and --no-search-header-columns options
(github #397).
* Add ctrl-L search modifier (github #367).
* A ctrl-P at the start of a shell command suppresses the "done"
message (github #462).
* Add attribute characters ('*', '~', '_', '&') to --color
parameter (github #471).
* Allow expansion of environment variables in lesskey files.
* Add LESSSECURE_ALLOW environment variable (github #449).
* Add LESS_UNSUPPORT environment variable.
* Add line number parameter to --header option (github #436).
* Mouse right-click jumps to position marked by left-click (github #390).
* Ensure that the target line is not obscured by a header line
set by --header (github #444).
* Change default character set to "utf-8", except remains "dos" on MS-DOS.
* Add message when search with ^W wraps (github #459).
* UCRT builds on Windows 10 and later now support Unicode file names
(github #438).
* Improve behavior of interrupt while reading non-terminated pipe
(github #414).
* Improve parsing of -j, -x and -# options (github #393).
* Support files larger than 4GB on Windows (github #417).
* Support entry of Unicode chars larger than U+FFFF on Windows (github #391).
* Improve colors of bold, underline and standout text on Windows.
* Allow --rscroll to accept non-ASCII characters (github #483).
* Allow the parameter to certain options to be terminated with a
space (--color, --quotes, --rscroll, --search-options
and --intr) (github #495).
* Fix bug where # substitution failed after viewing help (github #420).
* Fix crash if files are deleted while less is viewing them (github #404).
* Workaround unreliable ReadConsoleInputW behavior on Windows
with non-ASCII input.
* Fix -J display when searching for non-ASCII characters (github #422).
* Don't filter header lines via the & command (github #423).
* Fix bug when horizontally shifting long lines (github #425).
* Add -x and -D options to lesstest, to make it easier to diagnose
a failed lesstest run.
* Fix bug searching long lines with --incsearch and -S (github #428).
* Fix bug that made ESC-} fail if top line on screen was empty (github #429).
* Fix bug with --mouse on Windows when used with pipes (github #440).
* Fix bug in --+OPTION command line syntax.
* Fix display bug when using -w with an empty line with a CR/LF
line ending (github #474).
* When substituting '#' or '%' with a filename, quote the filename
if it contains a space (github #480).
* Fix wrong sleep time when system has usleep but not nanosleep (github #489).
* Fix bug when file name contains a newline.
* Fix bug when file name contains nonprintable characters (github #503).
* Fix DJGPP build (github #497).
* Update Unicode tables.
======================================================================
Major changes between "less" versions 633 and 643
* Fix problem when a program piping into less reads from the tty,
like sudo asking for password (github #368).
* Fix search modifier ^E after ^W.
* Fix bug using negated (^N) search (github #374).
* Fix bug setting colors with -D on Windows build (github #386).
* Fix reading special chars like PageDown on Windows (github #378).
* Fix mouse wheel scrolling on Windows (github #379).
* Fix erroneous EOF when terminal window size changes (github #372).
* Fix compile error with some definitions of ECHONL (github #395).
* Fix crash on Windows when writing logfile (github #405).
* Fix regression in exit code when stdin is /dev/null and
output is a file (github #373).
* Add lesstest test suite to production release (github #344).
* Change lesstest output to conform with
automake Simple Test Format (github #399).
======================================================================
Major changes between "less" versions 632 and 633
* Fix build on systems which have ncurses/termcap.h or
ncursesw/termcap.h but not termcap.h.
======================================================================
Major changes between "less" versions 608 and 632
* Add LESSUTFCHARDEF environment variable (github #275).
* Add # command (github #330).
* Add ^S search modifier (github #196).
* Add --wordwrap option (github #113).
* Add --no-vbell option (github #304).
* Add --no-search-headers option (github #44).
* Add --modelines option (github #89).
* Add --intr option (github #224).
* Add --proc-backspace, --proc-tab and --proc-return options (github #335).
* Add --show-preproc-errors option (github #258).
* Add LESS_LINES and LESS_COLUMNS environment variables (github #84).
* Add LESS_DATA_DELAY environment variable (github #337).
* Allow empty "lines" field in --header option.
* Update Unicode tables.
* Improve ability of ^X to interrupt F command (github #49).
* Status column (-J) shows off-screen matches.
* Parenthesized sub-patterns in searches are colored with unique colors,
if supported by the regular expression library (github #196).
* Don't allow opening a tty as file input unless -f is set (github #309).
* Don't require newline input after +&... option (github #339).
* Fix incorrect handling of some Private Use Unicode characters.
* Fix ANSI color bug when overstriking with colored chars (github #276).
* Fix compiler const warning (github #279).
* Fix signal race in iread (github #280).
* Fix reading procfs files on Linux (github #282).
* Fix --ignore-case with ctrl-R (no regex) search (github #300).
* Fix bug doing repeat search after setting & filter (github #299).
* Fix bug doing repeat search before non-repeat search.
* Fix crash with -R and certain line lengths (github #338).
* Fix input of Windows dead keys (github #352).
* Don't retain search options from a cancelled search (github #302).
* Don't call realpath on fake filenames like "-" (github #289).
* Implement lesstest test suite.
* Convert function parameter definitions from K&R to C89 (github #316).
======================================================================
Major changes between "less" versions 590 and 608
* Add the --header option (github #43).
* Add the --no-number-headers option (github #178).
* Add the --status-line option.
* Add the --redraw-on-quit option (github #36).
* Add the --search-options option (github #213).
* Add the --exit-follow-on-close option (github #244).
* Add 'H' color type to set color of header lines.
* Add #version conditional to lesskey.
* Add += syntax to variable section in lesskey files.
* Allow option name in -- command to end with '=' in addition to '\n'.
* Add $HOME/.config to possible locations of lesskey file (github #153).
* Add $XDG_STATE_HOME and $HOME/.local/state to possible locations
of history file (github #223).
* Don't read or write history file in secure mode (github #201).
* Fix display of multibyte and double-width chars in prompt.
* Fix ESC-BACKSPACE command when BACKSPACE key does not send 0x08
(github #188).
* Add more \k codes to lesskey format.
* Fix bug when empty file is modified while viewing it.
* Fix bug when parsing a malformed lesskey file (githb #234).
* Fix bug scrolling history when --incsearch is set (github #214).
* Fix buffer overflow when invoking lessecho with more than 63 -m/-n
options (github #198).
* Fix buffer overflow in bin_file (github #271).
* Fix bug restoring color at end of highlighted text.
* Fix bug in parsing lesskey file.
* Defer moving cursor to lower left in some more cases.
* Suppress TAB filename expansion in some cases where it doesn't make sense.
* Fix termlib detection when compiler doesn't accept
calls to undeclared functions.
* Fix bug in input of non-ASCII characters on Windows (github #247)
* Escape filenames when invoking LESSCLOSE.
* Fix bug using multibyte UTF-8 char in search string
with --incsearch (github #273).
======================================================================
Major changes between "less" versions 581 and 590
* Make less able to read lesskey source files (deprecating lesskey).
* If XDG_CONFIG_HOME is set, find lesskey source file
in $XDG_CONFIG_HOME/lesskey rather than $HOME/.lesskey.
* If XDG_DATA_HOME is set, find and store history file
in $XDG_DATA_HOME/lesshst rather than $HOME/.lesshst.
* Add the --lesskey-src option.
* Add the --file-size option.
* With -F, if screen is resized to make file fit on one screen, don't exit.
* Fix bug which could leave terminal in mouse-reporting mode
after exiting less.
* Fix bug which caused failure to respond to window resize.
* Fix backslash bug searching in tag file.
======================================================================
Major changes between "less" versions 563 and 581
* Change ESC-u command to toggle, not disable, highlighting per man page.
* Add ESC-U command.
* Add ctrl-W search modifier for wrapping search.
* F command can be interrupted by ^X.
* Support OSC 8 hyperlinks when -R is in effect.
* g command with no number will ignore -j and put first line at top of screen.
* Multiple + or -p command line options are handled better.
* Add the --incsearch option.
* Add the --line-num-width option.
* Add the --status-col-width option.
* Add the --use-color and --color options.
* Display -w highlight even if highlighted line is empty.
* If search result is in a long line, scroll to ensure it is visible.
* Editing the same file under different names now creates only
one entry in the file list.
* Make visual bell more visible on some terminals.
* Ring end-of-file bell no more than once per second.
* Build can use either Python or Perl for Makefile.aut operations.
* Fix crash when using the @ search modifier.
* Fix crash in the 's' command due to duplicate free.
* Fix realpath crash on Darwin.
======================================================================
Major changes between "less" versions 551 and 563
* Update Unicode tables.
* Treat Hangul Jamo medial vowels and final consonants as zero width.
* Display error message immediately when -o is toggled and
input is not a pipe.
* Fix regression: make screen repaint when "squished" and
a no-movement command is given.
* Fix erroneous EOF calculation when F command is interrupted.
* Make WIN32C version include this fix from 551:
Don't count lines in initial screen if using -X with -F.
* Fix display bug in WIN32C version.
* Fix memory corruption when built with libtermcap.
* Support libtinfow.
======================================================================
Major changes between "less" versions 530 and 551
* Add --mouse option.
* Add --wheel-lines option.
* Add --no-histdups option.
* Add --save-marks option.
* Support PCRE2 regular expression library.
* Redraw screen on SIGWINCH even if screen size doesn't change.
* Shell-escape filenames in history so they can be used again.
* Ring bell if user enters invalid long option name.
* Use PCRE_UTF8 flag for pcre regular expressions when in UTF-8 mode.
* Windows: use wide-char string to set console title.
* Don't count lines in initial screen if using -X with -F.
* Support mingw build system.
* Fix bug in v command on empty file.
* Fix bug in v command when filename contains shell metacharacters.
======================================================================
Major changes between "less" versions 487 and 530
* Don't output terminal init sequence if using -F and file fits on one screen.
* When using -S, mark truncated lines with a special character.
The character can be changed or disabled via the new --rscroll option.
* New command M marks the last line displayed on the screen.
* New command ESC-m removes a line mark.
* Status column (enabled via -J) now shows mark letters.
* Status column shows search matches even if highlighting is disabled via -G.
* A second ESC-u command will clear search match markers in the status column.
* Do same ANSI escape code filtering for tag matching that we do for
searching, to help when viewing syntax-highlighted code.
* Catch SIGTERM and clean up before exiting.
* Fix bug initializing default charset on Windows.
* Handle keypad ENTER key correctly if it sends something other than newline.
* Fix buffering bug when using stdin with a LESSOPEN pipe.
* On Windows, allow 'u' in -D option to enable underlining.
* On Windows, use underline in sgr mode.
* On Windows, convert UTF-8 to multibyte if console is not UTF-8.
* Update Unicode tables to 2017-03-08.
* Pass-thru Unicode formatting chars (Cf type) instead of treating them
as binary chars. But treat them as binary if -U is set.
* Fix erroneous binary file warning when UTF-8 file contains ANSI SGR sequences.
* Fix bugs when using LESSOPEN and switching between stdin and other files.
* Fix some bugs handling filenames containing shell metacharacters.
* Fix some memory leaks.
* Allow some debugging environment variables to be set in lesskey file.
* Code improvements:
. Use ANSI prototypes in funcs.h declarations.
. Fix some const mismatches.
. Remove archaic "register" in variable declarations.
======================================================================
Major changes between "less" versions 481 and 487
* New commands ESC-{ and ESC-} to shift to start/end of displayed lines.
* Make search highlights work correctly when changing caselessness with -i.
* New option -Da in Windows version to enable SGR mode.
* Fix "nothing to search" error when top or bottom line on screen is empty.
* Fix bug when terminal has no "cm" termcap entry.
* Fix incorrect display when entering double-width chars in search string.
* Fix bug in Unicode handling that missed some double width characters.
* Update Unicode database to 9.0.0.
======================================================================
Major changes between "less" versions 458 and 481
* Don't overwrite history file; just append to it.
* New command ESC-G goes to end of currently buffered data in a pipe.
* Disable history feature when compiled with LESSHISTFILE set to "-".
* In more-compatible mode, make the -p option apply to every file opened,
not just the first one.
* In more-compatible mode, change the -e option to work like -E, not -EF.
* Treat multiple CRs before LF are like one CR (all the CRs are hidden).
* Allow "extra" string in lesskey file to append to a multi-char command
(like a search pattern), without executing the command.
* Ignore -u/-U setting while viewing help file, so that
underline and bold chars are displayed correctly.
* Improve detection of "binary" files in UTF-8 mode.
* Fix bug with ++ commands.
* Fix bug where prompt was sometimes not displayed with +G.
* Fix possible memory corruption
* Fix bugs and improve performance in ampersand filtering.
* Automate construction of Unicode tables from Unicode database.
* Allow %% escape sequence in LESSOPEN variable.
======================================================================
Major changes between "less" versions 451 and 458
* Allow backslash escaping of metacharacters in LESS environment variable
after the --use-backslash option.
* Don't quit if syntax errors are found in command line options.
* Increase sizes of some internal buffers.
* Fix configure bug with --with-regex=none.
* Fix crash with "stty rows 0".
* Fix Win32 attribute display bug.
* Fix display bug when using up/down arrow on the command line.
======================================================================
Major changes between "less" versions 444 and 451
* Add ESC-F command to keep reading data until a pattern is found.
* Use exit code of LESSOPEN script if LESSOPEN starts with "||".
* When up/down arrow is used on the command line immediately after
typing text, the next command starting with that text is found.
* Add support for GNU regex.
* Add configure option --with-regex=none and fix compile errors
when compiling with no regex library.
* Fix bugs handling SGR sequences in Win32.
* Fix possible crashes caused by malformed LESSOPEN or
LESSCLOSE variables.
* Fix bug highlighting text which is discontiguous in the file
due to backspace processing.
* Fix bug in displaying status column when scrolling backwards
with -J and -S in effect.
======================================================================
Major changes between "less" versions 443 and 444
* Fix bug in unget handling that can cause strange effects on the
command line.
* Remove vestiges of obsolete -l option that can cause a crash.
======================================================================
Major changes between "less" versions 436 and 443
* Change search behavior such that when a search is given an explicit
pattern, the entire displayed screen is included in the search and
not just the portion after the target line.
* Add -A option to change search behavior to the old way: only
the portion of the screen after the target line is searched.
* Add %F formatting to prompt strings, replaced by the last component
of the input file.
* Control-G while editing a command exits the command.
* Less now exits with status 2 if control-C is pressed and -K is in effect.
* Fix "ungetc overflow" when passing long commands via the -p option.
* Fix bug in using line filtering via the & command
in combination with -i and -I.
* Fix bug in handling negative arguments to the -j option.
* Fix bug in handling %t in prompt strings.
* Improve handling of long option names.
* Improve percentage calculation for very large files.
======================================================================
Major changes between "less" versions 429 and 436
* Don't pass "-" to non-pipe LESSOPEN unless it starts with "-".
* Allow a fraction as the argument to the -# (--shift) option.
* Fix highlight bug when underlined/overstruck text matches at end of line.
* Fix non-regex searches with ctrl-R.
======================================================================
Major changes between "less" versions 424 and 429
* LESSOPEN pipe will now be used on standard input, if the LESSOPEN
environment variable begins with "|-".
* The -D option with one number now means use the normal background color.
* Don't change permissions on history file if it is not a regular file.
* Fix non-ANSI-compliant code that caused problems with some compilers.
* Fix binary file detection in UTF-8 mode.
* Fix display problems with long lines on "ignaw" terminals.
* Fix problem interrupting the line number calculation for initial prompt.
* Fix SGR emulation when dealing with multiple attributes (e.g. bold+underline).
* Fix highlight bug when searching for underlined/overstruck text.
======================================================================
Major changes between "less" versions 418 and 424
* New "&" command allows filtering of lines based on a pattern.
* Status column now displays a search match, even if the matched
string is scrolled off screen because -S is in effect.
* Improve behavior of -F option.
* Allow CSI character (0x9B) to work in UTF-8 mode.
* Output carriage return at startup in case terminal doesn't default
to column 1.
* Fix bug in '' (quote, quote) command after G command.
======================================================================
Major changes between "less" versions 416 and 418
* Color escape sequences are now supported in WIN32 build.
* Makefile now uses EXEEXT feature of autoconf.
* Fix search bug when using -R and text contains ANSI color escape sequences.
* Fix crash when using -r with UTF-8 text containing 0x9B bytes.
* Fix display bug when using ' command to move less than one page forward.
* Update GPL to version 3.
======================================================================
Major changes between "less" versions 409 and 416
* New --follow-name option makes F command follow the name of a file
rather than the file descriptor if an open file is renamed.
* Make searching with -i/-I work correctly with non-ASCII text.
* Fix DJGPP build.
======================================================================
Major changes between "less" versions 406 and 409
* Support CSI escape sequences, like SGR escape sequences.
* Fix bug which caused screen to fail to repaint when window is resized.
* Fix bug in using -i and -I flags with non-ASCII text.
* Fix configure bug on systems which don't support langinfo.h.
* Fix crash when searching text containing certain invalid UTF-8 sequences.
======================================================================
Major changes between "less" versions 394 and 406
* Allow decimal point in number for % (percent) command.
* Allow decimal point in number for -j option (fraction of screen height).
* Make n command fetch previous pattern from history file on first search.
* Don't rewrite history file if it has not changed.
* Don't move to bottom of screen on first page.
* Don't output extraneous newlines, so copy & pasting lines from the
output works better.
* The -c option has been made identical with the -C option.
* Allow "/dev/null" as synonym for "-" in LESSHISTFILE to indicate
that no history file should be used.
* Search can now find text which follows a null byte, if the PCRE
library is used, or if no-regex searching (ctrl-R) is used.
* Better compatibility with POSIX more specification.
* Make -f work for directories.
* Make "t" cmd traverse tags in the correct order.
* Allow a few binary characters in the input file before warning
that the file is binary.
* Don't warn that file is binary if it merely contains ANSI color sequences
and -R is in effect.
* Update Unicode character tables.
* Support DESTDIR in Makefile.
* Fix bug when filename contains certain shell metacharacters such as "$".
* Fix bug when resizing the window while waiting for input from a pipe.
* Fix configure bugs.
======================================================================
Major changes between "less" versions 382 and 394
* Add history file to save search and shell command history between
invocations of less.
* Improve behavior of history list for search and shell commands.
* Add -K (or --quit-on-intr) option to make less exit immediately on ctrl-C.
* Improve handling of UTF-8 files and commands, including better
line wrapping and handling double-width chars.
* Added LESSUTFBINFMT environment variable to control display of
non-printable characters in a UTF-8 file.
* Add --with-secure option to configure, to make it easier to
build a secure version of less.
* Show search matches in the status column even if search highlights
are disabled via the -G option or the ESC-u command.
* Improve performance when the file contains very long lines.
* Add "windows" charset.
* Add man page for lessecho.
* Add support for erase2 character, treated same as erase.
* Use ASCII lowercase/uppercase logic when operating on the command line.
* Update makefile for Borland C++ 5.5.1.
* Fix bug in calculating number of pages for %D prompt.
* Fix bug in handling tag file error.
* Fix obscure bug if input file is deleted while viewing help.
* Fix bug handling filenames which include square brackets.
* Fix possible buffer overflow in "global" tag search.
* Fix possible buffer overflow in usage of LESSOPEN and LESSCLOSE.
* Fix buffer overflow in reverse search.
======================================================================
Major changes between "less" versions 381 and 382
* Removed some old copyrighted code.
This probably breaks OS/9 support.
======================================================================
Major changes between "less" versions 378 and 381
* New -L option to disable LESSOPEN processing.
* Further support for large (64 bit) file addressing.
Large file support is now set up by the configure script.
* Use autoconf 2.54.
Replace configure.in, acconfig.h, defines.h.top with configure.ac.
* Overstriking underscore with underscore is now bold or underlined
depending on context.
* Use only 7 spaces for line numbers in -N mode, if possible.
* Fix some bugs in handling overstriking in UTF-8 files.
* Fix some nroff issues in the man page.
======================================================================
Major changes between "less" versions 376 and 378
* Bug fixes:
Default buffer space is now 64K as documented.
Search highlighting works properly when used with -R.
Windows version works properly when input file contains carriage returns.
Clean up some compiler warnings.
======================================================================
Major changes between "less" versions 358 and 376
* -x option can now specify multiple variable-width tab stops.
* -X option no longer disables keypad initialization.
New option --no-keypad disables keypad initialization.
* New commands t and T step through multiple tag matches.
Added support for "global(1)" tags
(see http://www.gnu.org/software/global/global.html).
* New prompt style set by option -Pw defines the message printed
while waiting for data in the F command.
* System-wide lesskey file now defaults to sysless in etc directory
instead of .sysless in bin directory.
Use "configure --sysconfdir=..." to change it.
(For backwards compatibility, .sysless in bin is still recognized.)
* Pressing RightArrow or LeftArrow while entering a number now shifts
the display N columns rather than editing the number itself.
* Status column (enabled with -J) now shows search results.
* Windows version sets window title.
* Default LESSCHARSET for MS-DOS versions is now "dos".
* Searching works better with ANSI (SGR) escape sequences.
ANSI color escape sequences are now supported in the MS-DOS (DJGPP) version.
* Improved performance in reading very large pipes.
* Eliminated some dependencies on file offsets being 32 bits.
* Fixed problems when viewing files with very long lines.
* Fixed overstriking in UTF-8 mode, and overstriking tabs.
* Improved horizontal shifting of text using -R option with ANSI color.
* Improved handling of filenames containing shell metacharacters.
* Some fixes for EBCDIC systems.
* Some fixes for OS/2 systems.
======================================================================
Major changes between "less" versions 354 and 358
* Add -J (--status-column) option to display a status column.
* Add -# (--shift) option to set default horizontal shift distance.
Default horizontal shift distance is now one-half screen width.
* Horizontal shifting does not shift line numbers if -N is in effect.
* Horizontal shifting acts as though -S were set, to avoid confusion.