Dear Maintainer,
I was looking for version numbers for all packages for xserver (to work on a
different bug), when I noticed this non-existing xserver package dependency.
I also noticed that this bug almost got fixed in
https://lists.debian.org/debian-x/2016/11/msg00259.html, but it went away there
for the bug reporter, so never really got fixed at that point.
It appears that this dependency might be accidentally loaded elsewhere, so
hidden.
I would expect this dependency to be named something like xserver-xorg-input-
abi-24, or perhaps removed altogether if another dependent package already
loaded requires it.
Thanks for looking at this.