Cursor Artifacts when using Nvidia Proprietary Driver

### What Happened?

When using the Nvidia Proprietary Driver, visual artifacts can sometimes be seen when the cursor changes state, i.e when hovering a button.

### Steps to Reproduce

1. Install Gala on a system with the Nvidia Proprietary Drivers
2. run Gala (i.e in pantheon) as a display server (not nested)
3. Make the state of the cursor change.

### Expected Behavior

The cursor should not show graphical artifacts.

### OS Version

Other Linux

### OS Architecture

amd64 (on most hardwares)

### Session Type

Secure Session (Wayland, This is the default)

### Software Version

Early Access or Compiled from git

### Log Output

```shell
N/A
```

### Hardware Info

I run with an `Nvidia GTX 1060 6GB` and the `580.142` drivers.