Different behaviours in line-final words...?

[nickpelling]

Anton: there is also the complicating factor that the right-hand edge is actually not very ragged, which implies that all line-terminal words apart from paragraph ends may often have had to be compressed to make them fit nicely.

So perhaps "span-terminal" should be restricted to a definition more like "immediately before interrupting drawings OR (line-terminal AND NOT paragraph-terminal)".