1817357 - Mousing off Library screen top menu produces an unwanted flash

Status: NEW

(Firefox :: Menus, defect, P3)

Description

[Ed]

Attachment: Biblioteca 2023-02-13 12-49-13.mp4

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/110.0

Steps to reproduce:

• open the Library (ctrl-shift-o)
• hover on any of the three menu choices at the top
• very slowly, mouse off the menu in any direction

Actual results:

For me, there is a black flash that fills the the menu choice background and disappears very quickly. I couldn't capture the flash with my gifcam software; I've attached a .mp4 from a Reddit post which is where I was first made aware of the phenomenon. That person has a blue flash.

Expected results:

There should be no flash when mousing off that menu.

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Firefox::Menus' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Ina Popescu, Desktop QA]

I didn't manage to reproduce this issue using the latest Nightly 112.0a1 and Firefox 110.0 on Windows 10 x64.
Could you please check if you are able to reproduce this issue using Firefox in safe mode or with a new profile?

Comment 3

[Ed]

Totally reproducible on FF release/beta/dev/nightly in safe mode and with new profiles. Interestingly, it also happens on the Thunderbird top menu (alt-v-t-m to show menu). It may be a Win7 thing; trying to get OS info from the other person on Reddit.

Comment 4

[Ed]

The other user is using Win11.

Comment 5

[Ina Popescu, Desktop QA]

Attachment: hovering _Nightly 91.0a1 vs Nightly 112.0a1.mp4

There is a noticeable blue flash when hovering the mouse over the Organize, Views and Import and Backup buttons from the Library window in the latest versions Nightly 112.0a1 and Firefox 110.0 on Windows7(please see the video hovering _Nightly 91.0a1 vs Nightly 112.0a1). I didn't manage to reproduce this issue on Windows 10 though.

I've tried to narrow down the regression window and found a possible culprit Bug 1705967, but I'm not sure this is accurate:
Last good 36647ef6f014ee7199a0bad93851750ead132473
First bad 2f69dc403886dd1c721cec815b00ec5bfca4b393
Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=36647ef6f014ee7199a0bad93851750ead132473&tochange=2f69dc403886dd1c721cec815b00ec5bfca4b393