Chrome Version: Chrome Version: 70.0.3538.77 (Official Build) Revision 0f6ce0b0cd63a12cb4eccea3637b1bc9a29148d9-refs/branch-heads/3538@{#1039} (32/64-bit)

OS: Mac (10.13.6, 10.14.1), Win (7, 8, 8.1, 10) & Linux (14.04 LTS)

Pre-condition: Enable the flag 'Enable using the Google local NTP' and 'New Tab Page Background Selection' from chrome://flags/

What steps will reproduce the problem?
(1) Launch chrome, open NTP and click on gear icon then select 'Choose background' option ('Select a collection' overlay will open).
(2) Select any collection and bring focus on wallpaper.
(3) To scroll wallpapers press the 'Spacebar' key and then press 'Down Arrow' key.
(4) Now Observe the scrollbar.

Actual Result: Down Arrow key input cause wallpaper page to scroll back to original position.

Expected Result: Down Arrow key input should not cause wallpaper page to scroll back to original position.

This is a Regression issue seen from 'M-70' and providing the bisect info below:
Good Build: 70.0.3503.0 (Revision: 578160)
Bad Build:  70.0.3504.0 (Revision: 578510)

You are probably looking for a change made after 578169 (known good), but no later than 578170 (first known bad).

CHANGE-LOG URL:

The script might not always return single CL as suspect as some perf builds might get missing due to failure.

https://chromium.googlesource.com/chromium/src/+log/7637ae87b8e8ef651fdcd15e8ace6da78053e6b0..b315c20043e0a5ad29ed29ce7d47aaba043b8204

Suspect: https://chromium.googlesource.com/chromium/src/+/b315c20043e0a5ad29ed29ce7d47aaba043b8204

@kmilka: Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

NOTE: Issue is also seen on M-70 Beta (build #70.0.3538.67), M-71 Dev (build #71.0.3578.20) & M-72 Beta (build #72.0.3590.0).

Kindly refer the attached screen-cast.

Thank You..!!

 

Deleted: Actual Video.mp4 2.6 MB

	Actual Video.mp4 2.6 MB View Download

Deleted: Expected Video.mp4 1.3 MB

	Expected Video.mp4 1.3 MB View Download