1468656 - Taskbar shows up on top of one video when there are multiple full-screen videos

Status: UNCONFIRMED

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

Description

[DarthSomebody]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0
Build ID: 20180503143129

Steps to reproduce:

1. Open one video (for example on Youtube) and make it fullscreen.
2. Open another video on a second monitor and make it fullscreen.


Actual results:

The taskbar shows up on top of the video that was first set to fullscreen.
Focusing the video hides the taskbar again.


Expected results:

The taskbar should not show up on top of the fullscreen video.

Comment 1

[Andre Klapper]

"Taskbar" of which application exactly?

Comment 2

[DarthSomebody]

The Windows 10 taskbar.

Comment 3

[Stefan [:StefanG_QA]]

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0 (20180605171542)

I have tested this report on Windows 10 using latest Nightly and Firefox release build. I did not manage to reproduce the reported issue. When playing two videos in fullscreen on a dual monitor system, I don't see the Windows taskbar on top of any video. 

Is it reproducible in safe mode or with a fresh profile? (https://goo.gl/PNe90E)
If yes, could you provide a short video showing the issue?

Comment 4

[DarthSomebody]

This is with a new profile in safe mode: https://youtu.be/3g9yxAdjyeU
I deactivated Avast and closed all other software (except the Logitech software and OBS).

I only captured 2 monitors here, but I'm actually using 5. Opening 5 videos in fullscreen will still only show the taskbar on 1 monitor. It's always the video that was fullscreened first where the taskbar shows up.

I tested Opera and Chrome, and they do not have this problem.

Comment 5

[Stefan [:StefanG_QA]]

Thanks for the video. Its really heplfull to see the issue. However, given the fact that the issue seems to be related to something that is specific to your setup, could you please try to find a regression range using mozregression tool?
Information on the tool is available at http://mozilla.github.io/mozregression/. Please don't hesitate to contact us if you encounter any problems.

Comment 6

[Stefan [:StefanG_QA]]

Is this reproducible on your end with the latest Nightly or Beta build? 

Based on other similar reports I think the correct component would be Core::Widged:Win32. Please change if this is not the right component.

Comment 7

[DarthSomebody]

I used Mozregression and went back as far as the build from 2013-02-27. This is the first build where it is possible to set 2 videos to fullscreen. It's the same problem with the taskbar there.

I installed the latest Nightly build now, and it's reproducible there, too.

Comment 8

[Ray Kraesig [:rkraesig]]

This may have been resolved by bug 1732517, which involved significant changes to the Windows fullscreen code.

If you're still out there and listening, you may want to test on the latest Nightly version of Firefox.