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When laying out abspos boxes, we compute the height twice: before and after the inside of the box has been laid out. The first pass allows percentage vertical values inside the box to be resolved against the box's height. The second pass resolves the final used value for the height of the box itself. In cases where the box height depends on the results of inside layout, we were incorrectly setting the box to having a definite zero height. This led to incorrect results when sizing an abspos flex container, since the FFC sizes containers (in row layouts) based on whether the container has a definite height. To avoid this problem, this patch adds an enum so we can differentiate between the two abspos height computation passes. If the first pass discovers a dependency on the inside layout, we simply bail out of computing the height, leaving it as indefinite. This allows the FFC to size its container correctly, and the correct height gets set by the second pass. |
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