[Webkit-unassigned] [Bug 214035] New: [GTK][WinCairo] position:fixed layers are unnecessarily repainted by scrolling main content layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214035

            Bug ID: 214035
           Summary: [GTK][WinCairo] position:fixed layers are
                    unnecessarily repainted by scrolling main content
                    layer
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Hironori.Fujii at sony.com

Created attachment 403671

  --> https://bugs.webkit.org/attachment.cgi?id=403671&action=review

test content

[GTK][WinCairo] position:fixed layers are unnecessarily repainted by scrolling main content layer

1. Start MiniBrowser
2. Enable repainting counter
   [WinCairo] Menu → Debug  → Show Compositing Borders
   [GTK] prefereces... → Draw compositing indicaters
3. Open the test content
4. Scroll down by mouse wheel

Actual: The repainting counter of position:fixed layer is rapidly increasing.
Expected: No such repainting

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