1474770 - Scroll judder when chrome expands or contracts

Status: RESOLVED DUPLICATE of bug 1277712

(Firefox for Android Graveyard :: Toolbar, defect)

Description

[rishel.nick]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180704003137

Steps to reproduce:

Scroll the page (slowly to emphasize effect) to expand or contract the chrome on Android.


Actual results:

When the chrome expands or contracts there is a noticeable judder in the page as it scrolls.


Expected results:

There should be no apparent judder.

Comment 1

[rishel.nick]

Attachment: FF Android Scroll Judder.mp4

Video of judder when scrolling filmed at 120fps.

Comment 2

[rishel.nick]

I suspect this contributes to the apparent scrolling issues experienced on Android. Possibly relevant to the Quantum Flow project.

Comment 3

[Stefan Deiac]

Thanks for reporting this.
I could reproduce the issue with previous devices: Huawei MediaPad M2 (Android 5.1.1), Nexus 5 (Android 6.0.1) and Xiaomi Mi4i (Android 5.0.2) on Firefox 61.0, but it looks like the issue it's a cause of toolbar reaper.

Comment 4

[Stefan Deiac]

Hello.
After forward investigation it seems the issue it is not reproducible on latest Nightly and Beta. Could you please try on latest Nightly and come with the results?

Comment 5

[rishel.nick]

It doesn't seem to be occurring in beta. There's still a purely perceptual "kick" when the URL bar suddenly stops that could likely be softened by dampening and/or spring-back effect, but that probably warrants a different report?

Comment 6

[Stefan Deiac]

This issue seems to be duplicate of bug 1277712. I will mark this as duplicate of other, please follow the discussion there.