1728061 - Maximize animation bleeding into other monitor

Status: NEW

(Core :: Graphics, defect)

Description

[kimjj2110]

Attachment: Sometimes grabs firefox titlebar.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0

Steps to reproduce:

To reproduce, Follow these steps:

1. Two display as Over-Under setup. (aka "Stacked monitor")
2. Hide or move Windows Taskbar to expose bottom edge of top display.
3. Maximize Firefox in the bottom display.

Notes:
Even if you don't have 2nd monitor, you can see this animation bleeding happening if you carefully watch top edge of firefox when maximizing.
Can be worked around if titlebar is enabled.

Actual results:

Firefox maximize animation has some weird (usually)white line only on top edge which just moves over to another monitor.

Expected results:

Not bleeding into other monitor. Or not having white line; be transparent like 3 other sides.

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 revert this change in case you think the bot is wrong.

Comment 2

[Andrei Purice]

Reproduced on the latest versions of Firefox Nightly 93.0a1 (2021-08-30), beta 92.0b9 and release 91.0.2.
Setting up flags and a component in order to get the dev team involved.
If you feel it's an incorrect one please feel free to change it to a more appropriate one.
Not a recent regression as this issue can be traced back to at least Firefox 80.0.

Comment 3

[kimjj2110]

(In reply to Andrei Purice from comment #2)

Reproduced on the latest versions of Firefox Nightly 93.0a1 (2021-08-30), beta 92.0b9 and release 91.0.2.
Setting up flags and a component in order to get the dev team involved.
If you feel it's an incorrect one please feel free to change it to a more appropriate one.
Not a recent regression as this issue can be traced back to at least Firefox 80.0.

First time using bugzilla and was waiting for someone like you to fix flags for me. To be honest, I have no idea what category this bug belongs to. I'm pretty much hands off from now on.

Comment 4

[Bob Hood [:bhood]]

Can you reproduce this behavior with the current release?

Comment 5

[kimjj2110]

I can't test this anymore as I upgraded my OS to windows 11 when it launched. although, this behavior immediately disappeared when I upgraded it, as windows 11 changed its maximize animation.