1991304 - Regression Rendering bug when a bunch of things apply.

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[psychpsyo]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:143.0) Gecko/20100101 Firefox/143.0

Steps to reproduce:

The only way that I can reproduce this involves some steps on an actual website, so I've attached a video showing those. The page in the video is https://battle.crossuniverse.net/settings/
Saving and re-opening the page in the broken state does not replicate the issue, so something about the steps to get there is important.

Since it's quite quick to do and 100% reliable, I've also used mozregression to track it back to https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=d765404a14b81fe15bb6bf8168fcad4fcaf58f5a&tochange=d357e4d1b535964c8ebfbc28c3ea8b060dbace07
Out of the commits there, only https://hg-edge.mozilla.org/integration/autoland/rev/8928a2ee7ce83dfc9d0f56c803e5b7c67af40c11 looks like it might be the culprit.

Actual results:

As seen in the video, whenever the main area is hovered, certain parts get darker and specific sections of a backdrop-filter blur stop applying.

Expected results:

The page should not change when hovering the area in question.

Comment 1

[psychpsyo]

Attachment: Repro Steps

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Graphics: WebRender' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

:emilio, since you are the author of the regressor, bug 1972694, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 4

[Emilio Cobos Álvarez [:emilio]]

Since it varies based on the DPI and without style changes (e.g., I can't reproduce on a smaller window) I think there's something on the WR side... An invalidation bug or so? Glenn can you take a look?

Comment 5

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1972694

Comment 6

[Glenn Watson [:gw]]

I won't have a chance to look at it for some time, but I'll put it on my list to take a look when I can.

Comment 7

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:gw, could you have a look please?

For more information, please visit BugBot documentation.

Comment 8

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1972694