Created attachment 161073 [details]
Missing option in Touchpad setting for Plasma 5.24.7

Hi Everyone,

This is a wishlist item. It came from a discussion in libinput's bug tracker at https://gitlab.freedesktop.org/libinput/libinput/-/issues/924. In the 924 bug report, there is a HP laptop with touchpad, and I want to disable the touchpad when a mouse is plugged into the machine.

The KDE wish is, we need a UI setting to disable the touchpad when the mouse is plugged in. libinput supports the configuration, but the KDE setting for Touchpad does not expose it.

For libinput, this is the [manual] X11 option of interest. Many thanks to @satrmb for the help in tracking it down:

```
$ cat /etc/X11/xorg.conf.d/30-touchpad.conf
Section "InputClass"
        Identifier "touchpad"
        Driver "libinput"
        MatchIsTouchpad "on"
        Option "SendEventsMode" "disabled-on-external-mouse"
EndSection
```

@satrmb is not sure what setting is needed for Wayland.

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I am using Kubuntu 22.04.3, x86_64, fully patched. Plasmashell version is 5.24.7.

I see some other "disable touchpad with Mouse plugged in" reports, but I definitely do not have the setting. See, for example, 349545 and 415364.