1653149 - When using multiple monitors when a Firefox window is maximized part of it appears on adjacent monitor

Status: RESOLVED DUPLICATE of bug 1614218

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

Description

[Alacritous]

Attachment: Photo of the issue from the view of me, the user.

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

I have 4 monitors arranged in an inverted T formation. 3 along the bottom and 1 on the top in the middle. The primary monitor is the center on the bottom. When I maximize a Firefox window in the primary monitor in the center on the bottom the issue occurs.

Actual results:

When a Firefox window is maximized on the primary monitor a portion of the frame of the Firefox window appears at the bottom of the monitor on the top.

I can only attach 1 image so I'm including a photo of the problem as seen on the monitors themselves. In the photo there is a single Firefox window open on the desktop maximized on the primary monitor. this file is titled, "actualview.jpg." you can see the portion of the window visible on the upper monitor.

This does not happen with other programs and changing the positions of the monitors via the display control panel does not change this behaviour.

In the photo you can see the thin grey/whiteish bar at the bottom of the upper monitor.

No portion of the Firefox window is visible on the other monitors if the Firefox window is maximized on any monitor other than the primary monitor.

The monitors are identified as follows.

4
1 2 3

the resolutions are as follows.

1: 1680x1050
2: 1920x1080
3: 1680x1050
4: 1920x1080

All monitors are using their native resolution.

Expected results:

The window should maximize on the current monitor and no part of the window should be visible on other monitors.

Comment 1

[Alacritous]

No it's not a task bar. I have the taskbar set to only on the primary monitor and not collapsed. And it goes away if the Firefox window on the primary monitor is not maximized.

Comment 2

[Alacritous]

Attachment: displaycontrolpanel.png

If you're going to try and replicate this, make sure the monitors are arranged properly in the display control panel. the upper and lower monitors should be very closely spaced as shown in the image.

Comment 3

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

The severity field is not set for this bug.
:jimm, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 4

[Erwin Dondorp]

I confirm this bug as it happens to me as well.
2 monitor setup, 1 above the other. Firefox maximized on the lower monitor shows a part of the title-bar at the bottom part of the top monitor.