RESOLVED FIXED309962
[threaded-animations] remote timeline is not preserved in update for animation targeting primary and backdrop layers 
https://bugs.webkit.org/show_bug.cgi?id=309962
Summary [threaded-animations] remote timeline is not preserved in update for animatio...
Antoine Quint
Reported 2026-03-14 13:45:31 PDT
If an animation targets both the primary and backdrop layers for an element, updating that animation will crash the UI process because we're hitting `RELEASE_ASSERT(timeline, "Remote layer tree animations should have a pre-registered timeline.")` in `RemoteLayerTreeNode::setAcceleratedEffectsAndBaseValues()`.
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Antoine Quint
Comment 1 2026-03-14 13:45:41 PDT
rdar://171248927
Antoine Quint
Comment 2 2026-03-14 14:01:06 PDT
https://github.com/WebKit/WebKit/pull/60639
EWS
Comment 3 2026-03-14 17:38:21 PDT
Committed 309277@main (9ca97ba47fc5): <https://commits.webkit.org/309277@main> Reviewed commits have been landed. Closing PR #60639 and removing active labels.
EWS
Comment 4 2026-03-14 22:11:41 PDT
Committed 305413.481@safari-7624-branch (c26ef46a3ebb): <https://commits.webkit.org/305413.481@safari-7624-branch> Reviewed commits have been landed. Closing PR #4717 and removing active labels.
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