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Surprisingly, every escape sequence can also be used as an argument
delimiter for an outer escape sequence, in which case the delimiting
escape sequence retains its syntax but usually ignores its argument
and loses its inherent effect.  Add rudimentary support for this
syntax quirk in order to improve parsing compatibility with groff.

.\" $OpenBSD: h.in,v 1.7 2022/06/08 13:08:00 schwarze Exp $
.Dd $Mdocdate: June 8 2022 $
.Dt ESC-H 1
.Os
.Sh NAME
.Nm esc-h
.Nd the roff escape h sequence: horizontal movement
.Sh DESCRIPTION
simple: >\h'0'<
.br
rounding: >\h'0.16i'<
.br
absolute: >\h'|12n'<
.br
escape only: >\h'\w'\&'M'<
.br
escape at the end: >\h'0+\w'\&''<
.br
escape at the beginning: >\h'\w'\&'M+0'<
.br
escape in the middle: >\h'0+\w'\&'+0'<
.Ss Argument delimiters
invalid ASCII: >\h-<
.br
unsupported \e!: \h\!2\!u
.br
unsupported \er: \h\r2u
.br
ignored \e%: \h\%2\%u
.br
ignored \e&: \h\&2\&u
.br
ignored \e): \h\)2\)u
.br
ignored \e,: \h\,2\,u
.br
ignored \e/: \h\/2\/u
.br
ignored \e^: \h\^2\^u
.br
ignored \ea: \h\a2\au
.br
ignored \ed: \h\d2\du
.br
ignored \et: \h\t2\tu
.br
ignored \eu: \h\u2\uu
.br
ignored \e{: \h\{2\{u
.br
ignored \e|: \h\|2\|u
.br
ignored \e}: \h\}2\}u
.br
useless \e.: \h\.2.u
.\".br
.\"XXX useless \e\e: \h\\2\\u
.br
invalid \eG: \h\G2Gu
.br
special \e\ : \h\ 2\ u
.br
special \e\(aq: \h\'2\'u
.br
special \e-: \h\-2\-u
.br
special \e0: \h\02\0u
.br
special \e:: \h\:2\:u
.br
special \e_: \h\_2\_u
.br
special \e\(ga: \h\`2\`u
.br
special \ee: \h\e2\eu
.br
special \e~: \h\~2\~u
.br
break \ep: \h\p2\pu
.br
nospace \ec: \h\c2\cu
.\".br
.\"XXX skipchar \ec: \h\z2\zu
.br
.ds mystr x2xu
string expansion: \h\*[mystr]
.br
.nr myreg 121
register expansion: \h\n[myreg]u
.br
ignored \eO: \h\O12\O2u
.br
ignored \eY: \h\Y[mystr]2\Y[mystr]u
.br
ignored \ek: \h\k[myreg]2\k[myreg]u
.br
special character: \h\(hy2\(hyu
.br
ignored \eD: \h\D't 1'2\D't 3'u
.br
ignored \eL: \h\L'3'2u
.br
ignored \eX: \h\X'foo'2\X'bar'u
.br
ignored \eZ: \h\Z'foo'2\Z''u
.br
ignored \eb: \h\b'3'2\b''u
.br
ignored \ev: \h\v'3'2\v'0'u
.br
ignored \ex: \h\x'3'2\v'0'u
.br
horizontal motion: \h\h'1'2\h'3'u
.br
horizontal line: \h\l'4'2\l'3'u
.br
overstrike: \h\o'ab'2\o'cd'u