Follow-up Comment #7, bug #64043 (project groff):
Oh, I forgot to mention after that long detour through Lesk's 1979 tmac.s...
Even though your display distance is 0, there is still vertical space after
the equation in your small sample document because a section heading follows.
I predict, but haven't fired up SIMH to check, that Unix V7 ms would permit
the space after the displayed equation to accumulate with sectioning space,
which would be (IMO) incorrect as a matter of pleasant page layout.
Moreover, this directly addresses the exhibits attached as ms-1.png and
ms-2.png. I think _groff_ is doing the right thing here, and indeed, this
issue doesn't have anything to do with the changes I made consequent to bug
#62688--groff 1.22.4 behaves the same way.
These are indeed some highly stochastic goal posts.
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