[web] [beta-44] [regression from beta 41] mvcp flicker when appending items start

[PaulSenon]

noticed a regression when upgrading from beta-40 to beta-41.
When lazyloading item on top, with mvcp, it now flickers for a frame (it's quick so on my 60fps capture some are not visible but it's really obvious on 120Hz screen)

Here is the before after:

BEFORE (beta-40 ok)

mvcp-non-layout-stable-on-load-more-regression-beta-40-to-41-before.mp4

AFTER (beta-41 KO)

mvcp-non-layout-stable-on-load-more-regression-beta-40-to-41-after.mp4

The bug can be observed in example-web http://localhost:5173/bidirectional-infinite-list when scrolling top slowly near the prepend trigger

Note

set CPU slowdown x4 if hard to see, then it makes it SUPER obvious

If the root cause isn't obvious, let me know I'll create dedicated reproduction url.

[PaulSenon]

UPDATE: beta-42 -> issue still present
UPDATE: beta-43 -> issue still present
UPDATE: beta-44 -> issue still present

[jmeistrich]

I think this might be fixed in 3.0.0-beta.47. Can you please give that a try and let me know if it's working better?

[PaulSenon]

Struggled to reproduce, so definitely something has been fixed.
And testing it deeper, the only little flickers I could reproduce trying super hard came from some ref churn on my side when prepending a new page of content.

So no longer an issue.
Closing this,
Thanks again for your hard work