I have noticed this feature request while I was trying to figure out if
an issue with pager had been reported. Actually pager has been added
without mentioning this bug number:
with further improvements:
APT doesn't respect pager's configuration with apt show
- <https://bugs.launchpad.net/bugs/2104280>
[FFe] Pass -SMK to less
There is a request to avoid trimming of long lines by "apt show":
<https://bugs.debian.org/1104623>
I think, this bug may be either closed or retitled to document the new
feature.