[bug #54101] documentation for .ss either incorrect or incomplete

[Dave]

Follow-up Comment #5, bug #54101 (project groff):

The second .ss argument has an effect: the ps file you attached definitely
shows a difference between its various values.  This file also further
illustrates (probably better than my original example) the problem reported in
this bug report: because SENTENCE_SPACE_SIZE spaces are not stretchable, the
massive stretching of the WORD_SPACE_SIZE spaces dwarfs the fixed-width
SENTENCE_SPACE_SIZE spaces to the point that they're nearly imperceptible. 
But if you zoom in, you can tell that the words on different lines are not
aligned.

This more strongly makes me think, as I began to ponder in comment #1, that
the proper fix is to alter the software to match the documentation rather than
vice versa.  It makes little typographic sense to have extra sentence spacing
when this amount of space cannot be adjusted for filling.

But again, this decision should probably be made according to historical
typesetting practice, and I'm not familiar with the details of how additional
sentence space was historically implemented.

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