1764537 - Inconsistent border width snapping (to device pixels) after each scroll

Status: NEW

(Core :: Graphics: WebRender, defect)

Description

[sergiy.goncharuk]

User Agent: Mozilla/5.0 (Android 11; Mobile; rv:100.0) Gecko/100.0 Firefox/100.0
Firefox for Android

Steps to reproduce:

During scrolling a website (e.g. bugzilla) I see intermittently disappeared borders on many elements after each scroll.

My device: Poco X3 Pro with 1080x2400 6.67" screen
chrome:gpu says that my screen has 393x873dp resolution with 2.75 scale (maybe fractional scale factor is related to this bug).

Comment 1

[sergiy.goncharuk]

Attachment: about_config.txt

Comment 2

[sergiy.goncharuk]

Attachment: Screenrecorder-2022-04-13-13-47-06-254.mp4

The green "Assignee" label with intermittently disappeared borders after each scroll.

Comment 3

[Emilio Cobos Álvarez (:emilio)]

I see this only when zoomed out, even on RDM. We usually snap borders to be at least one device pixel, but pinch zoom can make them go under that. But in that case this seems more of a graphics than layout bug.

Comment 4

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

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

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