2056627 - [Nova] Youtube right-click context menu causes video to partially render with blank boxes around it (uses backdrop-filter)

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect)

Description

[Kestrel]

Attachment: Partially rendered youtube video when context menu open

STR:

1. Launch latest Nightly 155.0a1 with browser.nova.enabled = true on Ubuntu 26.04.
2. Open a youtube video.
3. Right-click in lower-right corner of video several times.

Expected:
Video continues to fully render like before.

Actual:
Video partially renders with blank boxes around context menu which uses a backdrop-filter blur.

Happens with HW-WR and SW-WR.

With Nova disabled, occurs with combination of block-radius on .browserContainer and padding on #browser.

Minimal test case userChrome.css:

:root:not([inFullscreen], [inDOMFullscreen]) #browser {
  padding: 4px;
}

#tabbrowser-tabpanels .browserContainer {
  border-radius: 10px;
}

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=676cba4beaf09b39289490e05a9dc62644a61cf5&tochange=cbd53d6a5a10da605f0880454a3e31c90aae1d32

Regressed by Bug 2023711.

Earlier regression window with userChrome.css:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=2000f91172260e6be5ae2dcc2dd9d63c788f7f13&tochange=70d18b424eda660c0a0776c07ff001d7cf632774

Regressed by Bug 1994121.

Comment 1

[Stephen Thompson [:sthompson]]

Thanks for the report. My team (:sclements or :sthompson) or the Acorn team (:mstriemer or :hjones) can consult on the engineering side as stewards of the design implementation that pads the #browser and puts a rounded corner around the .browserContainer. We can connect with our design partners if there are any tradeoffs that we need to make as a result of this WebRender behavior.

Comment 2

[BugBot [:suhaib / :marco]]

:jswinarton, since you are the author of the regressor, bug 2023711, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 3

[Sotaro Ikeda [:sotaro]]

I am going to look from gfx side. Bug 1994121 seemed to be related to the problem.

Comment 4

[Sotaro Ikeda [:sotaro]]

Kestrel, can you attach about:support to this bug?

Hmm, I could not reproduce the problem with latest m-c on Ubuntu 26.04. Is there a tip to reproduce the problem?

Comment 5

[Kestrel]

I can reproduce it on multiple systems running Ubuntu 26.04 and 24.04 with clean profiles. It reproduces with layers.acceleration.disabled = true which eliminates most graphics hardware variables. Make sure the window is large enough not to be in compact mode which removes the border-radius or force density with about:preferences#appearance > Window Density > Standard.

Comment 6

[Sotaro Ikeda [:sotaro]]

I could reproduce the problem only once. Since then, the problem did not happen for me. I am not sure what caused the different.

Comment 7

[Sotaro Ikeda [:sotaro]]

When the video was paused, it was easier to confirm the problem.

Comment 8

[Sotaro Ikeda [:sotaro]]

Attachment: Bug 2056627 - Invalidate tiles that intersects with cancelled underlays

Comment 9

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/bd3be7b65450
https://hg.mozilla.org/integration/autoland/rev/3d8e4d994b59
Invalidate tiles that intersects with cancelled underlays r=gfx-reviewers,nical

Comment 10

[Norisz Fay [:noriszfay]]

https://hg.mozilla.org/mozilla-central/rev/3d8e4d994b59