2059455 - some lines of wrapped link not underlined on hover

Status: VERIFIED FIXED

(Core :: Graphics: WebRender, defect)

Description

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Firefox 155.0a1 20260729213106 on Windows 11

If this Slack message is open in the sidebar in Slack with winder.innerHeight 891 and innerWidth at 1409 pixel while the device pixel ratio is 1.25, only every second line of the link gets underlined. The DOM Inspector shows the whole link as one element.

Comment 1

[BugBot [:suhaib / :marco]]

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

For more information, please visit BugBot documentation.

Comment 2

[BugBot [:suhaib / :marco]]

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

For more information, please visit BugBot documentation.

Comment 3

[Glenn Watson [:gw]]

Attachment: Bug 2059455 - Round a decoration line's clips outward so they cannot shave its snapped row.

Comment 4

[Glenn Watson [:gw]]

Attachment: Bug 2059455 - Round a decoration range clip outward on the block axis so it cannot shave the line.

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/d1a16dbeff97
https://hg.mozilla.org/integration/autoland/rev/c75cf8a6c788
Round a decoration range clip outward on the block axis so it cannot shave the line. r=layout-reviewers,emilio

Comment 6

[Norisz Fay [:noriszfay]]

https://hg.mozilla.org/mozilla-central/rev/c75cf8a6c788

Comment 7

[BugBot [:suhaib / :marco]]

The patch landed in nightly and beta is affected.
:gw, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
  • See https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift for documentation on how to request an uplift.
• If no, please set status-firefox155 to wontfix.

For more information, please visit BugBot documentation.

Comment 8

[Glenn Watson [:gw]]

Attachment: Bug 2059455 - Round a decoration range clip outward on the block axis so it cannot shave the line.

Original Revision: https://phabricator.services.mozilla.com/D318361

Comment 9

[Phabricator Automation]

firefox-beta Uplift Approval Request

• User impact if declined/Reason for urgency: Visual artifacts
• Code covered by automated testing?: yes
• Fix verified in Nightly?: yes
• Needs manual QE testing?: yes
• Steps to reproduce for manual QE testing: Per bug report
• Risk associated with taking this patch: low
• Explanation of risk level: Small patch
• String changes made/needed?: No
• Is Android affected?: yes

Comment 10

[Pulsebot]

https://github.com/mozilla-firefox/firefox/commit/eb9157b54e91
https://hg.mozilla.org/releases/mozilla-beta/rev/1809bd02a0ce

Comment 11

[Timea Zsoldos [:tzsoldos], Desktop QA]

I have reproduced this issue using Firefox 155.0a1 (2026.07.24) on Windows 11.
I can confirm this issue is fixed, I verified using latest Nightly Firefox 156.0a1 (2026.08.19) and Firefox 155.0b1-build2 on Windows 11.