Surface Selection stops working if the cursor leaves boundary of the brush / 2021.3.0f1

[alexjhetherington]

Reproducing 2021.3.0f1 personal. Not reproducing on 2019.

Does not cause any large usability issues but makes it feel "slow"

Video:
https://user-images.githubusercontent.com/36995359/164752942-6b691a49-eaee-4daf-bf7d-72adfb5f4fe2.mov

Saved asset folder:
Assets.zip

[nukeandbeans]

Poking around with this, it appears that a repaint event isn't triggered properly for hover selection previews, causing the selection previews to appear sluggish or unresponsive.

I am able to fix this with a rough hack, but said hack causes high CPU and GPU use.

[Janooba]

Not sure I fully understand the repro steps as the video link is broken now, but I can't seem to reproduce the issue with #349 so I'm happy saying it's fixed.
Tested on 2019.4.31f1 and 2020.3.35f1