"Switch desktop" gesture no longer working on KDE Plasma 5.23

[jbouter]

Describe the bug

When using the "Switch desktop" option for a swipe gesture, it is not executed. Changing it to a different option, however, works fine. This affects both X11 and Wayland session of the KDE Plasma 5.23 desktop

Expected behaviour

The desktop should be switched

Actual behaviour

Absolutely nothing :-(

Logs

If required, include logs of the bug:

$ touchegg --debug
Touchégg v2.0.11.
Starting Touchégg in client mode
Parsing your configuration file...
Using configuration file "/home/jeffrey/.config/touchegg/touchegg.conf"
Configuration parsed successfully
Connecting to Touchégg daemon...
Connection with Touchégg established
Gesture begin detected
        Gesture information:
                Fingers: 4
                Type: SWIPE
                Direction: RIGHT
        Gesture performed on app: konsole
        Action configured for this gesture
        Starting action
Gesture update detected (1.38749%)
Gesture update detected (2.11395%)
Gesture update detected (3.0233%)
Gesture update detected (4.019%)
Gesture update detected (5.04011%)
Gesture update detected (6.0663%)
Gesture update detected (7.05184%)
Gesture end detected
Gesture begin detected
        Gesture information:
                Fingers: 4
                Type: SWIPE
                Direction: LEFT
        Gesture performed on app: konsole
        Action configured for this gesture
        Starting action
Gesture update detected (0.757556%)
Gesture update detected (1.56022%)
Gesture update detected (2.434%)
Gesture update detected (3.35859%)
Gesture update detected (4.17141%)
Gesture update detected (4.91819%)
Gesture update detected (5.80213%)
Gesture update detected (6.67591%)
Gesture end detected

Your environment

• Version of Touchégg: Touchégg v2.0.11.
• Operating System: KDE Neon (Ubuntu 20.04 LTS)
• Desktop Environment: KDE

[jbouter]

This bug also affects Touchégg v2.0.12.

[JoseExposito]

Hi @jbouter, thanks for the detailed bug report.

What's your libinput version? (libinput --version)

There was a breaking change in libinput 1.18 affecting how movement deltas are measured that I check at compile time.

I assume you're using the PPA version for Ubuntu 20.04, compiled against libinput 1.15. If your system has a different version of libinput, that'd explain why at the end of the gesture only the ~7% of the action was reached. The solution would be recompiling Touchégg.

[jbouter]

Hey @JoseExposito,

Thanks for getting back to me! My libinput version is 1.19.1:

$ libinput --version
1.19.1

Should I recompile touchegg locally?

[JoseExposito]

Yes, that should fix the issue.

It looks like KDE Neon ships a newer version of libinput that the one used in the PPA.

[jbouter]

Is there also a .deb available built against a newer version of libinput?

[JoseExposito]

I guess you could download from the PPA the package for Ubuntu 21.10, which uses libinput 1.18.1:
https://code.launchpad.net/~touchegg/+archive/ubuntu/stable/+build/22323264

But I don't know if it's going to work. I can manually build one for you in case you find problems building it.

[jbouter]

I've tried modifying the PPA to use the impish version, but obviously that just ends up with different mismatching dependencies. No need to build a package for me, considering I build it often enough for the AUR package :-) Thanks for your assistance thus far!