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Issue 664208 link

Starred by 2 users
Status: Duplicate
Owner:
sahel@chromium.org
Closed: Feb 2017
Cc:
█ krajshree@chromium.org
tdres...@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 3
Type: Bug



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Momentum scrolling follows cursor and irritates users

Reported by jojo.rud...@gmail.com, Nov 10 2016 
Google Chrome	54.0.2840.71 (Official Build) (64-bit)
Revision	5e302be61aa30f443d8ba24c9ece85e8f6076fb9-refs/branch-heads/2840@{#765}

URLs (if applicable) : http://codepen.io/anon/pen/VmeKxw?editors=1100#0
OS version               : 10.11.6
Behavior in Safari 3.x/4.x (if applicable): works
Behavior in Firefox 3.x (if applicable):
Behavior in Chrome for Windows:

What steps will reproduce the problem?
(1) Open the following URL, which contains a simple flexgrid layout with two vertically scrollable divs: http://codepen.io/anon/pen/VmeKxw?editors=1100#0
(2) Start scrolling in the right pane (below "Page Header) and while the content is still scrolling move the mouse cursor to the sidebar (left pane)
(3) Observe that the right pane will stop scrolling, but the left will start scrolling with the remaining "momentum" of the initial scroll action initated on the right pane.


What is the expected result?
The right pane should continue scrolling. It is extremely irritating for the user to see that the pane under the cursor scrolls even though he did not initiate a scrolling action .

What happens instead?
The pane under the cursor begins to use "momentum scrolling".

Comment 1 by krajshree@chromium.org, Nov 11 2016

Cc: krajshree@chromium.org
Components: Blink>Scroll
Labels: Needs-Feedback
Unable to reproduce the issue in MacBook Pro (Retina, 15-inch, Mid 2014) 10.11.16 by using chrome reported version #54.0.2840.71 and latest canary #56.0.2916.0.

Steps followed to reproduce the issue are as follows:
-----------
1. Navigated to URL: http://codepen.io/anon/pen/VmeKxw?editors=1100#0 
2. Started scrolling in the right pane (below "Page Header) and while the content was still scrolling, moved the mouse cursor to the sidebar (left pane).
3. Observed that the right pane stopped scrolling, but the left also did not scroll when the mouse was hovered on it.

Attaching screen cast for reference.

jojo.rudolph@ - Could you please verify the screen cast and please let us know if it is the expected behavior.
664208.mp4
1.5 MB View Download

Comment 2 by dtapu...@chromium.org, Nov 14 2016

Labels: Hotlist-Input-Dev
Owner: sahel@chromium.org
Status: Assigned (was: Unconfirmed)
sahel@ we probably want to block this one on shipping touch pad scroll latching because fixing it should fall out of it with the current design.

Comment 3 by dtapu...@chromium.org, Nov 14 2016

Cc: tdres...@chromium.org

Comment 4 by jojo.rud...@gmail.com, Nov 15 2016 

krajshree@ your attempt to reproduce the issue looks correct to me, I agree however that there's no indication of the bug I observe in your screencast. I have attached one myself from my machine to demonstrate the issue.

I have further investigated the behavior and I am now certain that the issue DOES NOT occur with the built-in trackpad/touch pad of my macbook but it DOES occur when I use my MagicMouse (attached via Bluetooth). Can you reproduce it with this info?
repro.mov
2.7 MB Download

Comment 5 by dabo...@googlemail.com, Feb 7 2017 

i see something similar on a new macbook pro, but only in retina resolution.
i use the cappuccino framework, that uses a scollable div to catch the scroll events. this div is dynamically hidden.

when scrolling with momentum and change direction, the scrollbar advances in the wrong direction. this is probably, because after unhiding the scollable div, this element consumes the momentum leftover from the scrolling before hiding it.

Comment 6 by tdres...@chromium.org, Feb 7 2017

Mergedinto: 526463
Status: Duplicate (was: Assigned)
Duping - since this is exactly what scroll latching will fix.
►

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