> Ingo, how goes the `Bk' work?  Scanning through mandoc's rendering of
> current manuals, I see a lot of the following sort of breakage:
> 
> .Bk -words
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> .Op Fl a Ar b
> ...

The enclosed patch is a first stab at this.  It only works for explicit
`Bk -words' for now; it's trivial to extend this to SYNPRETTY.  As you
can see, it simply checks whether it's in a KEEP mode and resets to
PREKEEP if it's a line subsequent the prior node.

This fixes the badness mentioned above.

Thoughts?

Kristaps