Follow-up Comment #26, bug #64484 (group groff): Your \h'1i' example in \X is definitely a horizontal movement, and elicits an appropriate error. The input characters " ", "\ ", "\~" and "\0" all result in a horizontal movement, but the user does not know that, to them they all mean they want a visible gap between adjacent words, the choice of which they use gives some control over the size of the word gap, but they all signify the user intends a space sized gap between words.
The first three emit a space (good, that's what the user wanted) but \0 emits
the horizontal movement warning. For consistency they all should be treated
the same, either error or output a space.
\| and \^ should be silently ignored, as they are by nroff, so groff already
has the rule these are ignored in text based output, which is essentially the
contents of \X.
I like your "expert mode for experts" idea, particularly when you move to full
utf8 for groff, since you would pass the original utf8 string to the driver.
The only suggestion I have is that the grout language be extended, rather than
both modes producing "x X" could they be differentiated in some way.
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