haikuwebkit/LayoutTests/scrollingcoordinator/scrolling-tree/scroller-with-negative-z-ch...

This test should not assert or crash
REGRESSION (r246725 ): Crashes on twitch.tv https://bugs.webkit.org/show_bug.cgi?id=199176 Source/WebCore: rdar://problem/52071249 Reviewed by Zalan Bujtas. With a composited negative z-index child inside a scroller, we can register the overflow scroll proxy node before we've traversed the overflow layer, so it that layer hasn't got its OverflowScrollingNode yet. Thus, AsyncScrollingCoordinator::setRelatedOverflowScrollingNodes() can be called with an empty vector. Avoid crashing when this happens. Test: scrollingcoordinator/scrolling-tree/scroller-with-negative-z-child.html * page/scrolling/AsyncScrollingCoordinator.cpp: (WebCore::AsyncScrollingCoordinator::setRelatedOverflowScrollingNodes): * page/scrolling/cocoa/ScrollingTreeOverflowScrollProxyNode.mm: (WebCore::ScrollingTreeOverflowScrollProxyNode::commitStateBeforeChildren): LayoutTests: Reviewed by Zalan Bujtas. * scrollingcoordinator/scrolling-tree/scroller-with-negative-z-child-expected.txt: Added. * scrollingcoordinator/scrolling-tree/scroller-with-negative-z-child.html: Added. Canonical link: https://commits.webkit.org/213140@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@246766 268f45cc-cd09-0410-ab3c-d52691b4dbfc 2019-06-24 22:44:09 +00:00			`This test should not assert or crash`