[Webkit-unassigned] [Bug 199172] New: [iOS 13] Regression: Rubberband effect at the bottom stutters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199172

            Bug ID: 199172
           Summary: [iOS 13] Regression: Rubberband effect at the bottom
                    stutters
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mehmet.sahin at gmx.net

IOS 13 Official Beta - Safari for iPhone

Steps to reproduce: 

1.) Run Safari for iPhone on IOS 13 Official Beta
2.) Open a long page
3.) Scroll down to the end/bottom of the page until you receive a rubberband effect
4.) Do immediately a further swipe so that the toolbar at the bottom appear and the page receives a further rubberband effect.

Actual: The toolbar at the buttom appears but the rubberband effect of the page stutters. 

Expected: The toolbar should appear and the page should have a smooth rubberband effect.

This is a regression of a regression which was fixed again in iOS 11.1 with issue 149280 and <rdar://problem/22758169>. It is still working fine with Safari on IOS 12.3. But now again broken in iOS 13 :(

If you have any question, please let me know.

Thanks in advance.
Mehmet

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