Follow-up Comment #4, bug #61675 (project groff):
[comment #2 comment #2:]
> [comment #0 original submission:]
> > (There are other problems with footnotes in multi-column mode; as
> > can be seen above, the bottom of the column retreats up the page.
> ...
> > These issues are distinct and should be filed as separate tickets.)
>
> I was going to do just that, but before/after comparisons show that this
particular issue was fixed as a side effect of the commit cited in comment #1.
It's not clear _how_, based on the code changes of this commit, which appear
to have no effect on the root cause of this as explained over in bug #58736:
"when a trap is set in multi-column mode for placement of the footnote, that
trap is not cleared after the footnote is rendered. The result is that the
bottoms of your columns creep up the page as you go from left to right." And
the commit log talks only about the width of the footnote separator, so the
fix to the column height might be a surprise to the commit's author as well.
But I won't argue with success.
I can confirm that this "footnote retreat" problem appears to be resolved.
With the same input it shows up with groff 1.22.4 and not with groff Git
HEAD.
Most likely my hypothesized RCA of the cause of the retreat was simply wrong.
A new hypothesis is that an excessively long footnote separator caused advance
of the vertical position, albeit not in a way visible to the naked eye (since
there was no text after it to format), and that this threw off the extensive
arithmetic _me_(7) uses to compute the placement of the footnote ejection
trap.
$ ./build/test-groff -Tascii -me EXPERIMENTS/separatrix2.me
Jackdaws love quartzK.[2] Jack-
my big sphinx of daws love my big
quartzAE. Jackdaws sphinx of quartzJ.
love my big sphinx Jackdaws love my
of quartzAD. Jack- big sphinx of
daws love my big quartzI. Jackdaws
sphinx of quartzAC. love my big sphinx
Jackdaws love my of quartzH. Jack-
big sphinx of daws love my big
quartzAB. Jackdaws sphinx of quartzG.
love my big sphinx Jackdaws love my
of quartzAA. Jack- big sphinx of
daws love my big quartzF. Jackdaws
sphinx of quartzZ. love my big sphinx
Jackdaws love my of quartzE. Jack-
big sphinx of daws love my big
quartzY. Jackdaws sphinx of quartzD.
love my big sphinx Jackdaws love my
of quartzX. Jack- big sphinx of
daws love my big quartzC. Jackdaws
sphinx of quartzW. love my big sphinx
Jackdaws love my of quartzB. Jack-
big sphinx of daws love my big
quartzV.[1] Jack- sphinx of quartzA.
daws love my big
sphinx of quartzU.
Jackdaws love my
big sphinx of
quartzT. Jackdaws
love my big sphinx
of quartzS. Jack-
daws love my big
sphinx of quartzR.
Jackdaws love my
big sphinx of
quartzQ. Jackdaws
love my big sphinx
of quartzP. Jack-
daws love my big
sphinx of quartzO.
Jackdaws love my
big sphinx of
quartzN. Jackdaws
love my big sphinx
of quartzM. Jack-
daws love my big
sphinx of quartzL.
Jackdaws love my
big sphinx of
___________________ ___________________
[1] Sometimes. [2] Sometimes.
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