Follow-up Comment #5, bug #58958 (project groff):
In comment #3, the '-z' should have been '-Z'.
The "test-nroff" script is the same as the "nroff" script,
but uses "test-groff" instead of "groff" (bug #55941).
I now look at the space before the end of the output line to be a bug
in the processing of the escape sequence '\:' in such a position.
The escape sequence '\:' is not a (graphic) character in the most
common meaning.
It might be described as an instruction (to format a typeset
output).
The term for such "characters" (an element in a set) is "format
effectors". Unicode has a category named "format characters" (Cf) for
these.
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