2059339 - The autocomplete dropdown long entry highlight is cut off when the scrollbar is displayed

Status: VERIFIED FIXED

(Toolkit :: Form Autofill, defect, P3)

Description

[Alin Ilea, Desktop Test Engineering [PTO until Aug 31st]]

Attachment: 2026-07-30_10h32_06.mp4

Found in

• Nightly 155.0a1

Affected versions

• Nightly 155.0a1

Tested platforms

• All

Preconditions

• browser.nova.enabled = true
• Have at least 10 logins already saved and at least one long username

Steps to reproduce

1. Go to https://fill.dev/form/login-simple
2. Click in the username field

Expected result

• The autocomplete dropdown should adjust its width to display correctly all the entries.

Actual result

• When there are at least 8 entries in the dropdown, the scrollbar is displayed and the long entry highlight is cut off. The issue is not reproducible if there are fewer entries displayed in the dropdown, without the scrollbar.

Notes

• The issue is also reproducible for Addresses and Credit cards autocomplete dropdowns.
• The issue is also reproducible with browser.nova.enabled = false.

Comment 2

[Kalen Lu [:kalenlu]]

Attachment: Bug 2059339 - Add scrollbar gutter to autocomplete dropdown panel. r?mtigley

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/0a85514135aa
https://hg.mozilla.org/integration/autoland/rev/1054226da7b8
Add scrollbar gutter to autocomplete dropdown panel. r=desktop-theme-reviewers,sfoster,dimi

Comment 4

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/1054226da7b8

Comment 5

[Alin Ilea, Desktop Test Engineering [PTO until Aug 31st]]

Attachment: 2026-08-13_13h54_40.mp4

Verified - Fixed in Nightly 155.0a1(2026-08-13). The issue is no longer reproducible until the autocomplete dropdown width reaches the display limit. When a long entry is used and the autocomplete dropdown width reaches the edge of the screen, bug 2058849 is still reproducible, and I can reproduce it all the time now.
Also this fix regressed the bug 2063246.