1525896 - [Windows] Selected elements are misplaced in a hovered dropdown menu when using arrow keys in about:preferences

Status: NEW

(Core :: XUL, defect, P3)

Description

[Alexandru Trif, Desktop QA [:atrif]]

Affected versions

• Nightly 67.0a1 (20190206215551)
• Firefox 66.0b5 (20190204181317)

Affected platforms

• Windows 10 x64

Steps to reproduce

1. Launch Firefox and go to about:preferences.
2. Open a dropdown menu (e.g. Default font).
3. Hover over a random entry (e.g. “Corbel” font).
4. Press up/down arrow key (e.g. down arrow).

Expected result

• The selection is moved one step lower (on the following position).

Actual result

• The selection jumps from the default location under the hovered position.
• Attached a screen recording with the issue: https://drive.google.com/open?id=1wwW1I7LIz2ieng-iaD-MAah228DLdqTG

Regression range

• First bad: c26dbd63604d (2015-06-29)
• Last good: eaf4f9b45117 (2015-06-28)
• Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=eaf4f9b45117&tochange=c26dbd63604d

Additional notes

• Checked the behaviour on other browsers - the hovered element has the same color as the selected element and the selection is moved gradually one position at a time.

Comment 1

[Iulia Cristescu, QA [:JuliaC] (away, please needinfo? [e-mail])]

I can confirm the issue is reproducible on Windows 10 x64 and Windows 7 x64 using 67.0a1 (2019-02-06).

Comment 2

[Tim Spurway [:tspurway]]

Neil, is this going to be worked on for 66?