[Webkit-unassigned] [Bug 225387] New: scroll-padding not working correctly when scroll target is partially out of scroll port

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225387

            Bug ID: 225387
           Summary: scroll-padding not working correctly when scroll
                    target is partially out of scroll port
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mrobinson at webkit.org
                CC: simon.fraser at apple.com

Copied from 222259:

For additional context, I believe this may occur in STP too. Please compare the behavior of Safari to Firefox on https://codepen.io/comp615/pen/bGqbrEx

Click the "right" button a few times.

In Firefox (correct), on hitting C, D, E...the scroll is moved so that the selected item aligns with scroll-padding taken into account.

In Safari, (Wrong), D does not move the scroller (incorrect because it's behind the scroll-adding)...E also does not (wholly wrong because it's not even in the scroll frame)... and from there it moves the item alternatingly correctly

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