Marco should workaround invalid scroll event caused by mistake in X11/XInput 2.1 protocol design

[mikkorantalainen]

Expected behaviour

Chrome should scroll the usual amount.

Actual behaviour

Chrome scrolls roughly the same amount Firefox was scrolled while Firefox was active!

Steps to reproduce the behaviour

Preparations: Open Firefox and Chrome windows in maximized state and switch between the windows using alt-tab while the mouse cursor is above the content area. Load a long web page to both browsers and scroll near the middle of document in both Firefox and Chrome.

1. Switch to Chrome using alt-tab.
2. Scroll downwards with a couple of clicks on mouse wheel.
3. Keep mouse cursor above the browser content area and press Alt+tab to switch to Firefox.
4. Scroll downwards a lot using mouse wheel.
5. Switch back to Chrome using alt+tab
6. Scroll downwards one click using mouse wheel.

MATE general version

1.24.0

Package version

$ apt policy mate-desktop marco
mate-desktop:
Installed: 1.24.0-2
Candidate: 1.24.0-2
Version table:
*** 1.24.0-2 500
500 http://fi.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
100 /var/lib/dpkg/status
marco:
Installed: 1.24.0-1ubuntu1
Candidate: 1.24.0-1ubuntu1
Version table:
*** 1.24.0-1ubuntu1 500
500 http://fi.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
100 /var/lib/dpkg/status

Linux Distribution

$ lsb_release -a
LSB Version: core-11.1.0ubuntu2-noarch:printing-11.1.0ubuntu2-noarch:security-11.1.0ubuntu2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 20.04.6 LTS
Release: 20.04
Codename: focal

Link to bugreport of your Distribution (requirement)

https://bugs.launchpad.net/ubuntu/+source/marco/+bug/2018333

[lukefromdc]

For some reason two instances of Firefox (Chrome not installed here) don't do this