Periodic editor cursor misalignment on Android Chrome

Our staff is trying to hunt down a bug which seems to be somewhat similar to iOS 11 cursor misplacement, but this one is on Android Chrome. Discourse 1.9 stable.

Evidence:

What we know so far:

  • Not 100% repro - pattern not found yet.
  • Reported by multiple users/devices, but not by all. There is enough evidence to say that this is a real issue.
    • Personally I have not seen this on a low-end Huawei tablet
    • Could be related to ultra HD screens - reporters seem to have higher end devices?
  • Originally we suspected the incident might have correlation with our high traffic hours, when messages are bursting in at a very high frequency. However our moderator recorded the video above during low/normal traffic hours, so maybe this is related to scrolling and overlays, similar to iOS Safari case.
  • The 1st report about this came 22 days ago, but never before during our 2,5 years of operation. Chrome regression, maybe?
  • So far no repro reports on Firefox Android. We have encouraged users to try this as workaround.
  • Browser refresh seems help temporarily when this happens.