RESOLVED FIXED310809
[GTK][WPE] Sync initial `preserves3D` state for structural `GraphicsLayerCoordinated` 
https://bugs.webkit.org/show_bug.cgi?id=310809
Summary [GTK][WPE] Sync initial `preserves3D` state for structural `GraphicsLayerCoor...
Nikolas Zimmermann
Reported 2026-03-26 05:47:44 PDT
Structural GraphicsLayers (e.g. viewport anchor layers for position:sticky) are initialized with preserves3D=true in the base GraphicsLayer constructor, but this value was never synced to the CoordinatedPlatformLayer because Change::Preserves3D was not included in the initial pending changes. Since the value is already true, subsequent setPreserves3D(true) calls early-return without noting the change. This caused the SkiaCompositingLayer to have preserves3D=false, breaking 3D rendering context layer collection for preserve-3d scenes containing sticky-positioned elements. Always include Change::Preserves3D in the initial sync. This is the only property with a conditional default (true for Type::Structural, false otherwise) that differs between GraphicsLayer and CoordinatedPlatformLayer. All other synced properties have matching defaults in both classes.
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Nikolas Zimmermann
Comment 1 2026-03-26 05:50:46 PDT
Pull request: https://github.com/WebKit/WebKit/pull/61411
EWS
Comment 2 2026-03-26 07:09:38 PDT
Committed 309989@main (2a377397b561): <https://commits.webkit.org/309989@main> Reviewed commits have been landed. Closing PR #61411 and removing active labels.
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