Andreas Kling ff5273084d LibWeb: Serialize external content surface clears ...

Lock the shared Skia backend context before clearing an external
content back store.

Nested navigables render through PublishToExternalContent, and that
clear ran outside the locking used by normal display list playback.
This allowed multiple renderer threads to enter the same Ganesh
context concurrently and trip Skia's SingleOwner checks during
painting.

2026-04-13 12:26:14 +02:00

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