two-finger scrolling is far too fast

Steps to reproduce

1. get a laptop with a touchpad
2. Open gnome-control-center
3. select Devices, then "Mouse & Touchpad"
4. click the "Test Your Settings" button on top
5. scroll up

Current behavior

Scrolling is extremely sensitive - on my touchpad it takes about 2cm of dragging to get from bottom to top of the scroll area (maybe 20cm on-screen of travel).

Expected outcome

I would expect the on-screen distance scrolled to be relatively in-line with the physical distance scrolled with the touchpad

Version information

• Gnome 3.28.2
• GTK3 3.22.30-1
• clutter-gtk 1.8.4-1
• clutter 1.26.2-1
• libinput 1.11.3-1
• Arch Linux

Additional information

I tried testing with libinput debug-gui and the scrolling response seems good there, so it seems like the issue is somewhere between clutter and the gnome-control-center mouse test UI.

This is on an HP Spectre x360 laptop, though I don't think it's a hardware-specific issue because libinput seems to be reporting good values.

Let me know if there's any other useful information I can provide.