eventHandler().autoscrollInProgress() is only effective in the current frame, while in RenderLayer::scrollRectToVisible it might cross frames.
Created attachment 414863 [details] Patch
Created attachment 414888 [details] Patch
Comment on attachment 414888 [details] Patch Hi, I think this patch is ready to review. Please take a look, thanks!
<rdar://problem/71893259>