Bug 196724

Summary:	Sticky-positioned element inside async overflow:scroll moves incorrectly
Product:	WebKit	Reporter:	Simon Fraser (smfr) <simon.fraser>
Component:	Scrolling	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED DUPLICATE
Severity:	Normal	CC:	koivisto, simon.fraser
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Simon Fraser (smfr) 2019-04-08 21:06:21 PDT

For position:-webkit-sticky inside async overflow:scroll, there are several scenarios that we have to deal with:
1. Compositing ancestor is some ancestor outside the overflow:scroll
2. Compositing ancestor is the overflow:scroll (works OK now)
3. Compositing ancestor is an element inside the overflow:scroll

Comment 1 Simon Fraser (smfr) 2019-04-08 21:06:42 PDT

<rdar://problem/49667212>

Comment 2 Simon Fraser (smfr) 2019-04-08 21:38:06 PDT

In ScrollingTreeStickyNode::applyLayerPositions(), enclosingScrollingNodeIncludingSelf() is wrong if the scroller is not a compositing ancestor of the sticky.

Comment 3 Simon Fraser (smfr) 2019-06-11 13:56:25 PDT

I think bug 198532 fixed this.

*** This bug has been marked as a duplicate of bug 198532 ***