[Webkit-unassigned] [Bug 180577] New: Block which should have fixed position is bouncing when page is scrolled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180577

            Bug ID: 180577
           Summary: Block which should have fixed position is bouncing
                    when page is scrolled
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: annulen at yandex.ru
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

How to reproduce:

1. Open https://docs.python.org/3.3/library/stdtypes.html
2. Scroll down fast, e.g. with down arrow key
3. See sidebar on the left constantly bouncing up and down when scrolling

This reproduces with trunk in GTK port, and in Qt port as well. Probably other ports are affected too.
Chromium and Firefox seem to work correctly here.

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