void PaintPropertyTreeBuilder::updateMainThreadScrollingReasons( const LayoutObject& object, PaintPropertyTreeBuilderContext& context) { if (context.current.scroll && !object.document().settings()->threadedScrollingEnabled()) context.current.scroll->addMainThreadScrollingReasons( MainThreadScrollingReason::kThreadedScrollingDisabled); if (object.isBackgroundAttachmentFixedObject()) { auto* scrollNode = context.current.scroll; while ( scrollNode && !scrollNode->hasMainThreadScrollingReasons( MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects)) { scrollNode->addMainThreadScrollingReasons( MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects); scrollNode = scrollNode->parent(); } } }