[Webkit-unassigned] [Bug 214256] New: Scroll reset and position change cause flickers on the whole page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214256

            Bug ID: 214256
           Summary: Scroll reset and position change cause flickers on the
                    whole page
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joseaplwork at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 404145

  --> https://bugs.webkit.org/attachment.cgi?id=404145&action=review

reproducible blinking error

A div with long content blinks when you scroll and switching position "fixed/relative" by clicking the card 


What steps will reproduce the problem?
(1) Scroll the page to the end
(2) click on the card
(3) click again on the card

What is the expected result?
The card should be positioned without any blinks when changing CSS position property and changing scroll position

What is the actual result?
The floating card is blinking

Any additional information (anything else which may help us debug the
issue)?

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