Bug 311235

Summary: [Scroll anchoring][iOS] The scroll anchoring disablement heuristic does not work the root
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: ScrollingAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: simon.fraser, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Other   
Hardware: Unspecified   
OS: Unspecified   
See Also: https://bugs.webkit.org/show_bug.cgi?id=311227
https://bugs.webkit.org/show_bug.cgi?id=309019

Simon Fraser (smfr)
Reported 2026-03-31 16:54:57 PDT
The scroll anchoring heuristic (bug 311227) does not work on the root on iOS because `upateVisibleContentRects` reports that all scrolls coming from the UI process are "user" scrolls, even if they originated from a programmatic scroll, and this resets the heuristic.
Attachments
Radar WebKit Bug Importer
Comment 1 2026-03-31 16:55:04 PDT
Simon Fraser (smfr)
Comment 2 2026-03-31 17:30:46 PDT
See also bug 309019.
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