less: upgrade to v581.2.

(cherry picked from commit 50d31dbc6e2bc3aa6007edb8cdecbcb84e85d6c0)

less: upgrade to v581.

(cherry picked from commit 2235c7feac959bcc9ddfd6a2bc6be32102b1f84c)

Git Hash: c5c5683eb6c4e1d80e02e1e23e5c9bfc8f83c80b
Git Author: delphij@FreeBSD.org

MFC r367005: MFV r366990: less v563.

Relnotes: yes

MFC r349549: MFV r349535: less v551.

Relnotes: yes

MFC r316339,317396,317829,326010,329554: less v530.

Relnotes: yes

MFC r326799:

less(1): diff reduction vs upstream

No functional change.

Sponsored by: Spectra Logic Corp

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFV r293125: less v481.

MFC after: 1 month
Relnotes: yes

MFV: less v451.

MFV: less v449.

MFV: Update to less v443.

MFC after: 1 month

Update less to v436. This is considered as a bugfix release from vendor.

Major changes from v429:
* 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.

Approved by: re (kensmith, kib)

Update to less v429.

Restore historical behavior where more(1) does not check for dumb terminals.

Reported by: rwatson on -current
Tested by: keramida, rwatson
Approved by: re (rwatson)

Be more careful handling no_init flag. It should be enforced
in *all* less_is_more cases, On the other hand, quit_if_one_screen
should apply iff less_is_more *and* -e.

This change revises the previous change further, which tried
to make less(1) not to send @ti:@te before and after view of
one file in more(1) mode, but affected less -e behavior by
accident.

This is essentially the same patch desichen@ has posted on
-current@. I have adjusted it a bit in order to minimize
difference between our version and the vendor branch.

Approved by: re (bmah, earlier logically equivalent version)

Restore historical more(1) behavior (inhibit ti/te processing) which
accidently got broke during the last less(1) import.

Approved by: re(hrs), delphij

In more(1) mode, restore the historical behavior where curses init
and deinit characters are not delivered.

Instead of hacking screen.c, we set no_init to implement the behavior.

Reported by: mnag
Approved by: re (hrs)

Restore a historical behavior that +foo is considered as a
filename by more(1). The less(1) behavior is keep intact.

PR: bin/51488
Prodded by: demon
Approved by: re (hrs)

In previous releases of FreeBSD we have enforced -EfGm, and the
new less(1) version enforced only -Em. Restore old behavior in
respect with POLA.

Submitted by: ru (on -current@)

Resolve conflicts.

Resolve conflicts.

Merge vendor changes onto mainline.

Merge vendor changes onto mainline.

Make less act like more(1) when it is invoked as more.

Obtained from: NetBSD

This commit was generated by cvs2svn to compensate for changes in r60786,
which included commits to RCS files with non-trunk default branches.

Import the [now] dual licensed version 3.5.4 of less. It is
distributed under your choice of the GPL or a BSD style license.

Reviewed by: peter
Obtained from: http://home.flash.net/~marknu/less/