1514849 - Windows 10 fullscreen video while Firefox window is snapped to the top - taskbar remains visible

Status: RESOLVED DUPLICATE of bug 1482920

(Core :: DOM: Core & HTML, defect)

Description

[amarg]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Steps to reproduce:

-open a new Firefox window
-make sure that the window is in "free form" (not fullscreen, not minimized)
-"snap"/resize the window to the top, maximizing it over the whole vertical viewspace (but not the horizontal)
-play a video embedded on a website (for example any YouTube)
-switch that video to fullscreen via double click or "F" button (YouTube)


Actual results:

the video fills the whole screen, but the Windows taskbar at the bottom is still visible, cutting off that part of the video


Expected results:

the taskbar should not be visible

Comment 1

[Damira Akh]

I was not able to reproduce this issue.
Testing was done
Build ID 	20181018182531
User Agent 	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Comment 2

[Hsin-Yi Tsai (she/her)[:hsinyi]]

I can't reproduce it either, with FF64 on Win10.

Dear reporter, could you please make sure you're trying with a clean profile and with extensions disabled? Thanks.

Comment 3

[amarg]

Attachment: step1.png

Comment 4

[amarg]

Attachment: step2.png

Comment 5

[amarg]

Attachment: step3.png

Comment 6

[amarg]

Just checked on a different computer, with a clean profile, without any plug-ins. FF64. The issue can be reproduced here as well.

To clarify on how to reproduce the issue I've uploaded some pictures.

At first, open a new Firefox window and go to for example YouTube. Make sure that the window is in "free form" (not minimized, not maximized).
See the picture step1.png

Next, drag the upper border of the Firefox window to the top of the display/desktop. Observe how a transparent preview "shadow" will appear below the Firefox window that stretches from the lower border of the FF window to the task bar. This signals that the window will be vertically maximized when you drop the mouse. Now drop the mouse. The window will be vertically maximized.
See the picture step2.png

To verify that you have the correct base, point your mouse at the upper border of the Firefox window. You should only be able to see the mouse cursor in vertical resize mode, not the normal cursor.
See the picture step3.png

When you run any YouTube video in full screen in this configuration, you should see the windows taskbar.

Comment 7

[Xidorn Quan [:xidorn] UTC+10]

I haven't checked, but it sounds like another case of bug 1482920, which is also about snapped window going fullscreen. Could you try whether this problem is fixed in Firefox 65? If so it's probably safe to say this is a duplicate of that.

Comment 8

[amarg]

Just checked: Yup, that's the one. Couldn't reproduce this here bug in the current 65 nightly (anymore), so I guess the fix for 1482920 also fixes the vertical snap fix.

Comment 9

[Xidorn Quan [:xidorn] UTC+10]

Current nightly is 66, though. 65 is in beta, and should be released soon.