<!-- Need an svg element that references a clippath that is display none (so that we don't use the clip path). Then make the clippath no longer display none (and do it without touching the clippath itself, ie make an ancestor no longer display none). We should now draw the clip path, but the bug made us not invalidate. Then we can make things worse using retained display list partial updates by marking a frame modified that is affected by the clip path a couple times. The retained display list won't have the nsDisplayMask container, but the modified display list will have the nsDisplayMask, this will confuse merging when the same item appears inside two different containers.
Note that we image.testing.decode-sync.enabled=false for this test because sync decoding triggers extra invalidation which "fixes" this bug before it gets a chance to appear. Bug 1866411 tracks this.
-->
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