[Webkit-unassigned] [Bug 250438] New: tiled-drawing/scrolling/scroll-snap tests fail with UI-side compositing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250438

            Bug ID: 250438
           Summary: tiled-drawing/scrolling/scroll-snap tests fail with
                    UI-side compositing
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

These tests do things like:

    eventSender.keyDown("rightArrow");
    expectTrue(document.scrollingElement.scrollLeft == (window.innerWidth * scale), "arrow key div scrolled to second div.");

With UI-side compositing, arrow handling hits AsyncScrollingCoordinator::requestScrollPositionUpdate(), which bounces to the UI process, and then IPCs back to the web process via AsyncScrollingCoordinator::reconcileScrollingState() which updates the ScrollableArea's scroll position, which is then read by `scrollLeft`.

So the tests need to wait for a presentation update after dispatching the key.

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