1600498 - With dual monitors, a Firefox window maximized on one screen overflows onto the other by a few pixels [Win10 x64]

Status: RESOLVED DUPLICATE of bug 1614218

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

Description

[silverlight.the.unicorn]

Attachment: firefox-window-screen-overflow.zip

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0

Steps to reproduce:

1. Have dual monitor setup (extended desktop, side-by-side)
2. Open Firefox
3. Maximize Firefox window on one monitor
4. Make sure this Firefox window is focused

Actual results:

The edge of the Firefox window (a column just a few pixels wide at most, possibly just a single pixel wide) appears on the other monitor, on top of desktop or any other windows.

Two screenshots (packed into a .zip file) attached. One is my full desktop (both screens). The other is the same image, cropped to only the right-most screen; note the little bit of the Firefox window visible along the left-hand edge.

Other programs do not exhibit this behavior.

Expected results:

Firefox window is entirely constrained to the monitor it's maximized on.

Comment 1

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

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

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

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

For more information, please visit auto_nag documentation.

Comment 3

[Zdenek]

Attachment: 2020-01-26--10-34-11--ff-overflow.jpg

Comment 4

[code]

Also if standard system title bar is enabled, firefox window behaves normally. Problem is connected to custom firefox title bar (which is default for windows)