1629813 - [Customize mode] Several elements from the Overflow Menu are incorrectly displayed if the browser window width and height are reduced considerably

Status: NEW

(Firefox :: Toolbars and Customization, defect, P3)

Description

[Emil Ghitta, QA [:emilghitta]]

Attachment: Affected Build - Windows.png

Affected versions

• Firefox 75.0 (BuildId:20200403170909)
• Firefox 76.0b4 (BuildId:20200412214314)
• Firefox 77.0a1 (BuildID:20200413225327)
• Firefox 68.7.0esr (BuildId:20200403171148)

Affected platforms

• Windows 10 64bit
• macOS 10.14
• Ubuntu 18.04 64bit

Steps to reproduce

1. Launch Firefox.
2. Access the “hamburger” menu.
3. Click the “Customize” option.
4. Reduce the width and height of the browser window considerably.
5. Populate the overflow menu until it’s vertical scrollbar is displayed.

Expected result

• All the elements are correctly displayed within the Overflow menu.

Actual result

• Several elements are incorrectly displayed inside the Overflow menu.

Regression range

• This seems to be a regression.
• Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=afa310dc89beeb4b7a9564d2c89ff32906f427ad&tochange=5a8107262015714d2907a85abc24c847ad9b32d2
• Note: Unfortunately mozregression kept skipping builds and couldn’t point out the exact regressor.

Notes

• For more information regarding this issue, please observe the attached screenshots.

Comment 1

[Emil Ghitta, QA [:emilghitta]]

Attachment: Good Build - Windows.png

Comment 2

[Emil Ghitta, QA [:emilghitta]]

Attachment: Affected Build - macOS.png

Comment 3

[Tim Spurway [:tspurway]]

gijs could you set a priority on this?

Comment 4

[:Gijs (he/him)]

Probably regressed by bug 1461793. Either way, this has been broken for nearly 2 years (since July 2018) and this is the first we've heard of it, so probably no more than P3.

Comment 5

[Firefox Bug Husbandry Bot]

Updating Severity from minor to P4 per May 4th changes to Severity field and triage process.