Bug 266926 – REGRESSION(268028@main): Graphics artifacts when scrolling Heroku app

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

[Chris B]

For your information

macOS Sonoma Version 14.2.1 (23C71)
Safari Version 17.2.1 (19617.1.17.11.12)

has reintroduced bug 220892 that I previously reported and which had been fixed. This is a regression.

[Alexey Proskuryakov]

Thank you for the report!

https://webkit-debug.herokuapp.com is not available currently. Could you please provide steps to reproduce that we can use?

[Chris B]

Hello Alexey

Please use the URL and login credentials below for testing. Note, that the site will go down automatically if it is not actively being used, so please inform me if you cannot login and I will reactivate it as soon as possible. Thank you for your support.

Best regards
Chris


https://notefall.herokuapp.com/#main

Username: webkit
Password: Bug266926

Steps for observing the behaviour:

1. Login to the application
2. Select "Interest Profiles" from the navigation menu on the left side of the screen.
3. Select "Test 01" and then press "Edit"
4. Scroll the screen, select various items, execute actions, etc.

[Simon Fraser (smfr)]

I am not reproducing this on a build at 272420@main

[Alexey Proskuryakov]

I was able to reproduce some missing content (painted white) with built-in Safari on macOS 14.3 beta, M3 MacBook Pro. I haven't seen any other problems though.

[Radar WebKit Bug Importer]

<rdar://problem/120373474>

[zalan]

Created attachment 469261 [details]
Screenrecording (272565@main)

I am seeing some artifacts on ToT WebKit (272565@main) -see screen recording.

[Alexey Proskuryakov]

Assuming that you are talking about the table with "Lead Vocals" sometimes not painting, then yes, that's exactly what I observed.

[Chris B]

I do not see this behaviour on my:

MacBook Pro (Retina, 15-inch, Mid 2015)
Processor 2.8 GHz Quad-Core Intel Core i7
Memory 16 GB 1600 MHz DDR3
Graphics Intel Iris Pro 1536 MB

macOS Version 12.7.1 (21G920)
Safari Version 17.1 (17616.2.9.11.9, 17616)

I will have access to my 

macOS Sonoma Version 14.2.1 (23C71)
Safari Version 17.2.1 (19617.1.17.11.12)

system tomorrow or on Thursday at the latest and will provide some screen shots.

[Chris B]

Created attachment 469293 [details]
Screen video of error behavior

Hello Everyone

As promised, here is a screen video showing the behavior on the following system:

iMac (Retina 5K, 27-inch, 2020)
Processor 3.6 GHz 10-Core Intel Core i9
Memory 64 GB 2667 MHz DDR4
Graphics AMD Radeon Pro 5700 8 GB
macOS Sonoma Version 14.2.1 (23C71)
Safari Version 17.2.1 (19617.1.17.11.12)

I hope that this helps.

Best regards
Chris

[Simon Fraser (smfr)]

Created attachment 469493 [details]
Partial test reduction

Attaching a partial test reduction.

There are a couple of things you can do to work around the bug. Remove this weird hack:

  <div class="v-expand" style="padding-top:1628px">
    <div class="v-slot" style="margin-top:-1628px"></div>

and remove this zero sized position:fixed:
  <div style="position:fixed;top:0px;left:0px"></div>

[Chris B]

Thank you for the information, however, the "weird hack" that you are referring to comes from somewhere within the Jmix framework that I am using or its dependencies, e.g. Vaadin framework; I have no way to influence or manipulate it as far as I know. I have never seen it before.

I will report it to the Jmix team and maybe they will be able to modify it themselves or report it to the other framework owner.

[Simon Fraser (smfr)]

Pull request: https://github.com/WebKit/WebKit/pull/23724

[EWS]

Committed 273999@main (4b1ca4f3add8): <https://commits.webkit.org/273999@main>

Reviewed commits have been landed. Closing PR #23724 and removing active labels.

[Simon Fraser (smfr)]

I confirmed that the fix works on https://notefall.herokuapp.com/#main.

[maiken chen]

hi simon does this mr has been released in latest safari? i update my safari to Version 17.3.1 (19617.2.4.11.12), but i still can reproduce this problem.

[maiken chen]

hi chris does this mr has been released in latest safari? i update my safari to Version 17.3.1 (19617.2.4.11.12), but i still can reproduce this problem.

[Alexey Proskuryakov]

This fix should be included in Safari 17.4 betas, not in 17.3.1.