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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.

ESC-H(1)                    General Commands Manual                   ESC-H(1)

NNAAMMEE
     eesscc--hh - the roff escape h sequence: horizontal movement

DDEESSCCRRIIPPTTIIOONN
     simple: ><
     rounding: >  <
     absolute: > <
     escape only: ><
     escape at the end: ><
     escape at the beginning: ><
     escape in the middle: ><

   AArrgguummeenntt ddeelliimmiitteerrss
     invalid ASCII: ><
     unsupported \!:   u
     unsupported \r: 2u
     ignored \%:   u
     ignored \&:   u
     ignored \):   u
     ignored \,: 2u
     ignored \/:   u
     ignored \^: 2u
     ignored \a: 2u
     ignored \d: 2u
     ignored \t: 2u
     ignored \u: 2u
     ignored \{:   u
     ignored \|: 2u
     ignored \}:   u
     useless \.: 2.u
     invalid \G:   u
     special \ : 2 u
     special \':   u
     special \-:   u
     special \0: 2 u
     special \::   u
     special \_:   u
     special \`:   u
     special \e:   u
     special \~: 2 u
     break \p:   u
     nospace \c:   u
     string expansion:   u
     register expansion: 21u
     ignored \O: 2u
     ignored \Y: 2u
     ignored \k:   u
     special character:   u
     ignored \D: 2u
     ignored \L: 2u
     ignored \X: 2u
     ignored \Z: 2u
     ignored \b: 2u
     ignored \v: 2u
     ignored \x: 2u
     horizontal motion: 2   u
     horizontal line: 2___u
     overstrike: 2cdu

OpenBSD                          June 8, 2022                          OpenBSD