[Webkit-unassigned] [Bug 165474] New: Scroll position jumps to the origin when scrolling without momentum at the end of a scroll snapping container

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165474

            Bug ID: 165474
           Summary: Scroll position jumps to the origin when scrolling
                    without momentum at the end of a scroll snapping
                    container
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com

Happens on ToT, after adopting AppKit scroll snapping animations.

There are two ways to reproduce this problem:
1. Go to http://whsieh.github.io/examples/iphone-overflow
2. Scroll to the bottom, so that the last image completely fills the container
3. End the scroll gesture without momentum
 - This will occasionally result in the container's scrollTop jumping to 0.

Another way:
0. Go to any website
1. Navigate to http://whsieh.github.io/examples/iphone-mainframe
2. Scroll left slightly to reveal the previous page but release without momentum so the browser doesn't navigate to the previous page
 - This will result in the mainframe's scrollTop jumping to 0.

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