1774560 - [Windows] Hovering on any taskbar items triggers visibilitychange

Status: NEW

(Core :: Widget: Win32, defect, P3)

Description

[peacech]

Steps to reproduce:

1. Run firefox
2. Open developer tools console in a popup window
3. Paste window.addEventListener('visibilitychange', () => console.log(document.visibilityState));
4. Switch to another application which have maximized window to make the firefox window hidden (but not minimized).
5. Hover on any icons in the taskbar
6. The console will log hidden/visible even though the visiblity of the firefox windows does not change

This only happens if widget.windows.window_occlusion_tracking.enabled = true.
This does not happen if firefox window is minimized.

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:101.0) Gecko/20100101 Firefox/101.0

Actual results:

Hovering on any taskbar items when the firefox window is hidden but not minimized triggers visiblitychange.

Expected results:

visiblitychange should not be triggered when hoving on taskbar items while firefox window is hidden.

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Win32' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Stephen A Pohl [:spohl]]

Presumably regressed by bug 1732736.

Comment 3

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

Set release status flags based on info from the regressing bug 1732736

Comment 4

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

:sotaro, since you are the author of the regressor, bug 1732736, could you take a look?
For more information, please visit auto_nag documentation.

Comment 5

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

The bug has a release status flag that shows some version of Firefox is affected, thus it will be considered confirmed.

Comment 6

[Sotaro Ikeda [:sotaro]]

I confirmed the problem during hovering on the occluding window's icon in the taskbar. The same thing happened also with chrome browser.

Comment 7

[Dianna Smith [:diannaS] - on Leave, back on August 9th]

:sotaro to clarify, are there any actionable item left here or any next steps?