[bug #62983] [troff] want diagnostic if '\o' encountered while formatting for non-overstriking device

[Dave]

Follow-up Comment #6, bug #62983 (group groff):

Some observations about \o here also apply to \z.

However, while grotty has the same output for two characters overstruck with
either escape, grohtml emits only one of a set of characters overstruck with
\o, but both characters overstruck with \z.

$ printf '\o"+o" \z+o\n' | groff -Tascii | head -1 | od -c
0000000   +  \b   o       +  \b   o  \n
0000010
$ printf '\o"+o" \z+o\n' | groff -Thtml | fgrep '<p>'
<p>o + o</p>




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