Follow-up Comment #42, bug #63354 (group groff): Standard ECMA-48 (http://www.ecma-international.org/wp-content/uploads/ECMA-48_5th_edition_june_1991.pdf) has more verbiage but is no more explicit about this. Its description of BPH: BREAK PERMITTED HERE (see section 8.3.4) is, "BPH is used to indicate a point where a line break may occur when text is formatted. BPH may occur between two graphic characters, either or both of which may be SPACE."
Setting aside the quibble about whether a space qualifies as a "graphic
character" (I suppose it does in the worldview of this document, where the
other type is a control character), I'd say this answers by inference what it
doesn't answer explicitly. No one in their right mind would add a hyphen when
breaking two spaces. The clear, if unstated, intent of BPH is to specify a
possible break point that doesn't get hyphenated.
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