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Issue metadata

Status: Assigned
Owner:
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows
Pri: 2
Type: Bug

Blocking:
issue 497851


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[css-scroll-snap] Scrolling is sluggish when the mouse is moving

Reported by awesomep...@gmail.com, Jun 29 2018

Issue description

UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce the problem:
1. Go to test case:  https://codepen.io/maxakohler/pen/qKLyoy/?editors=0100
2. Scroll up and down inside the container while moving the mouse in any direction.

What is the expected behavior?
Scrolling behaviour / speed shouldn't be affected by mouse movement.

What went wrong?
Scrolling is slowed down / sluggish. This doesn't happen if 
a) scroll snapping is disabled or
b) you don't move the mouse while scrolling.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 67.0.3396.99  Channel: canary
OS Version: 10.0
Flash Version: 

See also this screen capture: https://drive.google.com/file/d/1WzsiBS4qb1BjX3A8uYYDjVtRiHfRfffn/view
 
Labels: Needs-Triage-M67
Components: Blink>Scroll
Cc: phanindra.mandapaka@chromium.org
Labels: -Type-Bug -Pri-2 ReleaseBlock-Stable Triaged-ET M-69 RegressedIn-69 hasbisect Target-69 FoundIn-69 OS-Linux Pri-1 Type-Bug-Regression
Owner: sunyunjia@chromium.org
Status: Assigned (was: Unconfirmed)
Able to reproduce the issue on the reported on ,latest canary 69.0.3483.0 using Windows10,Ubuntu17.10. Below is the bisect information for same.

Note: Issue not seen on Mac

Bisect Info:
================
Good build: 69.0.3469.0
Bad build: 69.0.3472.0

You are probably looking for a change made after 569660 (known good), but no later than 569666 (first known bad).

CHANGELOG URL:
https://chromium.googlesource.com/chromium/src/+log/b1cc586e5eb0c92bbb0c526609374f20e0dda4d2..2f1bec8fbac2adf64ef308ccabcd0481201f6c03

Suspect: https://chromium.googlesource.com/chromium/src/+/f13ce426d1f2ac45ca5bd2b8c728d8832d9598c0

Reviewed-on: https://chromium-review.googlesource.com/1110852

sunyunjia:Please confirm the issue and help in re-assigning if it is not related to your change.

Thanks!
Blocking: 497851
Labels: -Pri-1 -ReleaseBlock-Stable -Type-Bug-Regression -FoundIn-69 -RegressedIn-69 -Needs-Triage-M67 Pri-2 Type-Bug
css-scroll-snap is a new feature which was just enabled by the cl referred above. As in the bug description, this only happens when css-scroll-snap is enabled so this is a feature that needs polish, not a regression. I'll take a look at it and removing Bug-Regression.

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