Follow-up Comment #1, bug#65111 (group groff):
As I have documented elsewhere gropdf has to behave a little differently if a
particular font does not define a space glyph. This is because it can use a
slightly more compact format if the font defines "space" or "u0020" as a
glyph. In a "Hello World" example the difference is "(Hello World)" (glyph
defined) and "(Hello) move horizontal (World)" (glyph undefined). The distance
moved is set by troff, I assume this is the purpose of spacewidth in the groff
font. Some CJK fonts also don't have a space glyph. It is just a warning, and
was useful in debugging, to know gropdf had switched to a slightly less
efficient output format, the message could be removed, although knowing which
mode gropdf was operating in if I am debugging a user's issue could be useful.
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