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We can modify the scroll position without invalidating the anchor (that's kind of the point, actually). So it's possible (and ok) to end up with a frame which is already maintaining an anchor but for which CanMaintainAnchor now returns false. So if you have a scrollframe with a non-zero scroll position and select an anchor for that scrollframe, and then try to select an anchor for an ancestor, you don't want to dig into there. Differential Revision: https://phabricator.services.mozilla.com/D71103 --HG-- extra : moz-landing-system : lando
