My WIP patches in bug 1569701 can trigger an assertion ``` ASSERTION: Column set should be complete if the available block-size is unconstrained: 'aStatus.IsFullyComplete() || aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE' ``` on 1566672.html.
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My WIP patches in bug 1569701 can trigger an assertion ``` ASSERTION: Column set should be complete if the available block-size is unconstrained: 'aStatus.IsFullyComplete() || aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE' ``` on the crashtest [1566672.html](https://searchfox.org/mozilla-central/rev/c7e8bc4996f979e5876b33afae3de3b1ab4f3ae1/layout/base/crashtests/1566672.html).