// This function returns true if the given box requires overflow scrollbars (as // opposed to the 'viewport' scrollbars managed by the RenderLayerCompositor). // FIXME: we should use the same scrolling machinery for both the viewport and // overflow. Currently, we need to avoid producing scrollbars here if they'll be // handled externally in the RLC. static bool canHaveOverflowScrollbars(const RenderBox& box) { return !box.isRenderView() && box.document().viewportDefiningElement() != box.node(); }