[threaded-animation-resolution] discrete `filter` interpolation should not be accelerated

• Component: Animations
• Status: RESOLVED FIXED

[Antoine Quint]

The CSS `filter` property animates discretely if two `filter` values do not have a shared initial list of filter operations, as specified in https://drafts.fxtf.org/filter-effects/#interpolation-of-filters. What's more, the system we use to animate `filter` in the UIProcess relies on `CAPresentationModifier` on macOS and requires a known list of filter operations for initial setup, which falls apart if we are dealing with mis-matching filter lists. As such we must make sure we don't create `AcceleratedEffect` objects that contain `filter` values that will animate discretely.

[Antoine Quint]

Pull request: https://github.com/WebKit/WebKit/pull/24497

[EWS]

Committed 274755@main (c78d9eaa4297): <https://commits.webkit.org/274755@main>

Reviewed commits have been landed. Closing PR #24497 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/123030803>