Re: [groff] page location traps

[Tadziu Hoffmann]

> [...] and groff's devascii:

I was (partly) wrong about the devascii behavior.

In the example I had shown, some newer traps actually *replace*
older traps due to the limited vertical resolution (because the
position rounded to the nearest vertical resolution unit is the
same as that of a similarly rounded earlier trap position).

With the following code change

  .wh 10i t1
  .ch t1 2.1i
  .wh 10i t2
  .ch t2 2.2i
  .wh 10i t3
  .ch t3 2.3i
  .wh 10i t4
  .ch t4 2.4i
  .wh 10i t5
  .ch t5 2.5i
  .wh 10i t6
  .ch t6 2.6i

all the traps are kept, but again not all are sprung:

  vertical resolution is 240/in / 40
  t1      520
  t2      520
  t3      560
  t4      560
  t5      600
  t6      640
  trap 1 sprung, now at 520 u (2.166666 in), next trap in 40 u (0.166666 in)
  trap 3 sprung, now at 560 u (2.333333 in), next trap in 40 u (0.166666 in)
  trap 5 sprung, now at 600 u (2.500000 in), next trap in 40 u (0.166666 in)
  trap 6 sprung, now at 640 u (2.666666 in), next trap in 2000 u (8.333333 in)