Bug 1815822 Comment 4 Edit History

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If I'm right, the reason is that before bug 1814785, transforms translated to the parent. However, we don't update cached transforms when the position changes, so the transform would be translating us to the wrong place. After bug 1814785, transforms no longer include translation to the parent, so they are unaffected by position changes.
If I'm right, the reason is that before bug 1814785, transforms translated to the parent. However, we don't update cached transforms when the position changes, so the (stale) transform would be translating us to the wrong place after scrolling. After bug 1814785, transforms no longer include translation to the parent, so they are unaffected by position changes.

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