1707683 - Unexpected margin showing up at top or bottom when scrolling too fast.

Status: RESOLVED DUPLICATE of bug 1704410

(Core :: Panning and Zooming, defect)

Description

[milomoisson]

Attachment: Picture of Apple website with the offset

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:89.0) Gecko/20100101 Firefox/89.0

Steps to reproduce:

1. I opened a web page. (Like GitHub.com or apple.com, these are obvious)
2. I scroll fast to bottom and go up the same way.

Actual results:

The navbar has a little offset between the window's top and the navbar's top.
It disappears when you change tab.
I've noticed this since v89

Expected results:

The navbar should be fixed to the window's top.

Comment 1

[milomoisson]

Attachment: Here's the same without the offset (change tab)

Comment 2

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

The Bugbug bot thinks this bug should belong to the 'Core::Layout: Scrolling and Overflow' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 3

[Timothy Nikkel (:tnikkel)]

Hmm, this might be overscroll. What happens if you set apz.overscroll.enabled to false?

Comment 4

[Timothy Nikkel (:tnikkel)]

Also, what are you using to scroll? Touchpad? Magic mouse? Mouse wheel? Scrollbars?

Comment 5

[milomoisson]

(In reply to Timothy Nikkel (:tnikkel) from comment #3)
Hmm, this might be overscroll. What happens if you set apz.overscroll.enabled to false?

I changed apz.overscroll.enabled to false, I don't have this weird offset now.
Why does this option exist ?

I'm using an MX Vertical Logitech Mouse.
I also tried with a magic mouse, but I don't get the offset because of the scrolling behaviour.

Thanks for answers

Comment 6

[Timothy Nikkel (:tnikkel)]

Thanks for testing. Since you are using a mouse wheel sounds like should be fixed by bug 1704410 then.

Comment 7

[milomoisson]

Ok I close this as a duplicate...