[Debian templates] - [qubes-gui-agent] - Qubes GUI broken because of Xorg ABI Interface update in package xserver-xorg-core 2:1.20.0-2 (debian testing)

[mdik]

Qubes OS version: R4.0

Affected component(s): Debian Template VMs upgraded to testing or unstable

Steps to reproduce the behavior:

sudo apt update
sudo apt full-upgrade

Expected behavior:

System is up-to-date and operational

Actual behavior:

qubes-gui-agent gets removed during upgrade due to unresolved dependencies, i.e. xorg-video-abi-23 vs xorg-video-abi-24.

General notes:

The packages qubes-gui-agent and xserver-xorg-video-dummyqbs as they are provided by the Qubes Debian Repository for Debian testing, depend on the virtual package xorg-video-abi-23 while the new version of the xserver-xorg-core package provides org-video-abi-24.

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Related issues:

This is basically the same issue as
#2514
but for newer versions of Debian and Qubes OS ¯\_(ツ)_/¯