The adapted Mutter code by Red Hat engineer Michel Dänzer allows for the cursor to move at the maximum refresh rate with VRR. Dänzer explained in the merge request :
"If the fullscreen surface frame rate drops below 30 fps, allow the cursor to move at maximum refresh rate, instead of limiting it to ≤ 30 Hz.
The core changes are clutter/frame-clock: Use frame sync actor update time for VRR timeout & kms/crtc: Use VRR update time in meta_kms_crtc_determine_deadline, inspired by @Zamundaaa's description of how KWin handles this."
This should address various VRR issues with GNOME such as this bug report from over a year ago around low cursor frame rates when VRR is enabled.
A nice fix/improvement ahead of the big GNOME 49 release in September.