STR:

1. Visit https://schema.org/docs/schemas.html on Ubuntu 22.10 using SW-WR.
2. Scroll to the bottom of the page with the mousewheel.
3. Press the Home key to quickly scroll to the top of the page.
4. Repeat several times.

A white line sometimes appears at the top of the page and gets corrected a few seconds later. Correction happens faster when the mouse cursor is over the scrollbar. The overlay scrollbar disappearing seems to trigger correction, or moving the cursor across the page.

Does not happen with apz.paint_skipping.enabled = false.

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=61377e7604a69e7f3f385506db84b398ccfbd62d&tochange=248c025cb922254392e9e53311edae245284f740

Regressed by Bug 1745969.

:hiro, since you are the author of the regressor, bug 1745969, could you take a look? Also, could you set the severity field?

For more information, please visit auto_nag documentation.

I suppose this is caused by the same root cause of bug 1801098, but I am going to keep opening this bug separately for now.

Kestrel, I suppose this bug was fixed by bug 1817126, can you please try the latest nightly whether this bug is still there or not? Thanks!

I can confirm this was fixed by Bug 1817126.

Fix window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=c2b1b6360d9035172fc78d504eea2c09a8a9ff6b&tochange=c2fed5f4d90e79d02c21d53bd0ac6fb6d0f068a3

Thank you!

I've reproduced the issue using Firefox 112.0b2 on Ubuntu 22.04 after flipping following prefs in about:config :
gfx.webrender.all = true
gfx.webrender.software = true

The issue can not be reproduced anymore on Firefox 113.0b8 under same configuration.

Before closing this, Kestrel, could you please confirm that the issue no longer persists on your side?

Yes, I can no longer reproduce this on Beta 113.0b8 and Nightly 114.0a1 (2023-04-26) with "Webrender (Software)" on Ubuntu 23.04.

Thank you for confirming.
Closing as VERIFIED FIXED.