[Webkit-unassigned] [Bug 191022] New: Unstable rendering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191022

            Bug ID: 191022
           Summary: Unstable rendering
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: soyunhombrevirtual at gmail.com
                CC: webkit-bug-importer at group.apple.com

Chrome Version: 69.0.3497.100
OS Version: OS X 10.13.6
URLs (if applicable): https://minitatuajes.com/

What steps will reproduce the problem?
1. Open the above URL or any WebKit bug with a long patch on it.
2. Scroll up and down on the page *using 2 fingers scrolling* (other scrolling mechanism don't show the issue). Watch the bottom right bar with the review / commit-queue flag (which is fixed positioned).

What is the expected result?
As you scroll, there should be no difference in how we render the bottom right bar.

What happens instead?
The layout seems to toggle between 2 states as you scroll. Not sure if it's layout related or just that we improperly shift a compositing layer (scrolling shouldn't trigger a layout).

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