Mouse shouldn't be used (only standard touchpad on the MacBook).

In other words, all mouses (or the same devices) should be disabled (no usb/apple ports with mouses, etc).

Unable to reproduce the issue in MacBook Pro (Retina, 15-inch, Mid 2014) and Macbook air, 10.12.6 using chrome reported version #63.0.3223.0, latest dev #63.0.3230.0 and latest canary #63.0.3231.0.

Following are the steps followed to reproduce the issue.
------------
1. Enabled "Always show scrollbars" in system preferences.
2. Launched chrome and navigated to www.wikipedia.org with scrolling and observed that scrollbar was seen even when not scrolling.
3. Disabled always scrollbars from system preferences and navigated to www.wikipedia.org with scrolling and observed that scrollbar was hidden when not scrolling as expected.

Attaching screen cast for reference.

vladbelov@ - Could you please check the issue on latest dev #63.0.3230.0 or latest canary #63.0.3231.0 by creating a new profile without any apps and extensions and please let us know if the issue still persist or not.

Thanks...!!

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	771114.mp4 12.4 MB View Download

I used last dev build from here:
https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Mac/505511/

MacBook Pro (Retina, 15-inch, Mid 2015), no extensions, new profile. Also as I said before to reproduce this issue, mouse shouldn't be attached to the computer.

Deleted: screencast_2017-10-04_14-59-04.mp4 20.8 MB

screencast_2017-10-04_14-59-04.mp4 20.8 MB Download

Thank you for providing more feedback. Adding requester "krajshree@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Unable to reproduce the issue in MacBook Pro (Retina, 15-inch, Mid 2014), 10.12.6 using chrome reported version #63.0.3223.0(dev build) and latest canary #63.0.3233.0(dev build) from URL: https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Mac/505511/.

Following are the steps followed to reproduce the issue.
------------
1. Enabled "Always show scrollbars" in system preferences.
2. Launched chrome and navigated to www.wikipedia.org with scrolling and observed that scrollbar was seen even when not scrolling.
3. Disabled always scrollbars from system preferences and navigated to www.wikipedia.org with scrolling and observed that scrollbar was hidden when not scrolling as expected.

Attaching screen cast for reference.

Could any one from Blink>Scroll team please have a look into the issue as it is not reproducible from TE-end.
Note: Removing the Needs-Bisect label as of now. Please feel free to add the same if required.

Thanks...!!

Deleted: 771114@dev_build.mp4 14.6 MB

	771114@dev_build.mp4 14.6 MB View Download

I found why you can't reproduce, you're pressing "Reload page". But a page is resizing before reload.

Also if you're enabling then you'll see white box before reload. This is the issue too. This works correctly before the commit in the post.

Assigning to rsesek@ (author of patch), could you please take an initial look?

 Issue 794429  has been merged into this issue.

Any updates on the issue ?