Update of bug #64484 (group groff):
Status: Need Info => Postponed
Planned Release: 1.24.0 => None
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Follow-up Comment #11:
Postponing; I don't have hope of getting this sorted out in time for _groff_
1.24.
Two differences between the `device` request and `\X` escape sequence concern
me and, at the very least, should be documented.
1. `device` reads its argument in copy mode; `\X` doesn't.
2. `\X` is accepted, and works, at the beginning of input; `device` does
not.
Here are some illustrative cases.
$ printf '\\X@tty: foo\\h#1i#bar@\n' | groff -T ascii -Z
troff:<standard input>:1: error: a horizontal motion is invalid within device
control escape sequence
x T ascii
x res 240 24 40
x init
p1
V40
H0
x font 1 R
f1
s10
V40
H0
md
DFd
x X tty: foobar
n40 0
x trailer
V2640
x stop
$ printf '.device tty: foo\\h#1i#bar\n' | groff -T ascii -Z
x T ascii
x res 240 24 40
x init
p1
x trailer
V2640
x stop
$ printf '\\c\n.device tty: foo\\h#1i#bar\n' | groff -T ascii -Z
x T ascii
x res 240 24 40
x init
p1
V40
H0
x font 1 R
f1
s10
V40
H0
md
DFd
x X tty: foo\h#1i#bar
n40 0
x trailer
V2640
x stop
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