[bug #64484] [troff] .device and \X don't behave the same

[G. Branden Robinson]

Follow-up Comment #6, bug#64484 (group groff):

[comment #5 comment #5:]
> Another oddity is that you can invoke the `device` request too early, and it
won't be honored, but can use `\X` anywhere you want.

This turns out to be due to the presence of a break on a line using the \X
escape sequence, because it's delimited.  That explanation may not be complete
because this succeeds regardless.


\X'ps: nop'\c


So I guess what's actually happened is that a partially collected line exists
and that's enough to make the output copasetic.

But that means that my plan to make a new fatal error consequent to bug #65138
and also that that is probably a corner case.  Generally, you won't issue
device control command with a request but never even once have a partially
collected line in your document. 


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