[Webkit-unassigned] [Bug 243949] iOS 15.6 compositing with z-index causes crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243949

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Created attachment 461661

  --> https://bugs.webkit.org/attachment.cgi?id=461661&action=review

Static testcase

We make backing store for all the layers because they are inside a large, animated element ("container") so we keep all their backing stores alive.

There are several issues here:
1. The animation is a no-op, so we shouldn't consider it as something that extends backing store
2. z-index:-1 should not trigger backing store (`.native`) is a stacking context
3. Only `.container` should have backing while animating, because it's a stacking context.

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