1670256 - [Fission] After a redirection, scroll position is not retained after going back a page

Status: RESOLVED DUPLICATE of bug 1668083

(Core :: DOM: Navigation, defect, P3)

Description

[Fanolian]

Attachment: Scroll position bug screencast.mp4

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0
Build ID: 20201009041754

Steps to reproduce

1. Enable fission.
2. Go to https://www.hkepc.com/forum , which has a 301 Moved Permanently to https://www.hkepc.com/forum/ .
3. Scroll down.
4. Press a link that opens in the same tab. (Most non-ads will do.)
5. Go back 1 page.

Actual result

Scroll position is not retained. The page goes back to the top. (see attached video)

Expected result

I do not lose the scroll position.

Notes

If I visit https://www.hkepc.com/forum/ directly and repeat step 3 to 5, the bug is not exhibited.
Reloading the page, even when URL bar shows https://www.hkepc.com/forum/, still exhibit the bug.

Workaround

Disable Fission.

Comment 1

[Fanolian]

For Mozregression:
Last good Nightly: 2020-10-02
First bad Nightly: 2020-10-03
pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c25899d7b631470b983650ee254177381a62eaad&tochange=33139800aca52aac192973fe24c9b74df7c87e00

Bisecting autoland builds:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=ee7eeea3fb66321fabf86ffd3a1caf4fa3511e43&tochange=1aa67f749387d4d6d26f7d69511434ac71112110

This is regressed by bug 1668357.

Setting the tracking status for 83 to disabled as Fission is Nightly only.

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

Note, there were changes to redirect handling + session history last night, but I don't think that would have helped here.
But please test using the latest nightly.

Comment 3

[Fanolian]

This is fixed by bug 1668083. Thanks!