[Webkit-unassigned] [Bug 215641] New: Regression: Vertical scrolling lags when a horizontal scrollbox is in the scrolling path

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215641

            Bug ID: 215641
           Summary: Regression: Vertical scrolling lags when a horizontal
                    scrollbox is in the scrolling path
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mehmet.sahin at gmx.net

Created attachment 406829

  --> https://bugs.webkit.org/attachment.cgi?id=406829&action=review

Vertical scrolling lag

Safari Technology Preview
Release 112 (Safari 14.0, WebKit 15610.1.25.5.1)

OS: macOS 10.15.6
Type: Regression


Steps to reproduce:

1.) go to google.com
2.) search for "apple"
3.) scroll down until you see the video section, where you can scroll horizontally
4.) now move the mouse cursor over this box and try to scroll vertically up or down to the page

Actual result: Vertical scrolling lags, because it wants to scroll also horizontally.

Expected result: Vertical scrolling should not lag.

This seems to be a regression in Safari Technology Preview 14. This is not a problem in Safari Stable Version 13.1.2 (15609.3.5.1.3).

A screencast of the issue is attached.

Thanks for fixing it in advance.

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