[Webkit-unassigned] [Bug 103999] New: Rework bug 97927 to not depend on RenderLayer::allowsScrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103999

           Summary: Rework bug 97927 to not depend on
                    RenderLayer::allowsScrolling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tonikitoo at webkit.org
                CC: jamesr at chromium.org, skyostil at chromium.org
            Blocks: 97927


Instead of adding ::allowScrolling calls to check scrollability, check if scrolling in allowed in the direction where overflow happens.

That allow methods like  RenderLayer::updateScrollbarsAfterLayout and RenderLayer::updateScrollbarsAfterStyleChange to be scrollbars-agnostic.

Reason behind it: scrollbars can be disabled completely (not only "hidden") in WebCore, and its drawing delegated to the client application.

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