Adjust flex item position to account for reversal when laying out unconstrained #13936
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Eilon
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PureWeen
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May 15, 2023
samhouts
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Description of Change
Like most of Flex, RowReverse/ColumnReverse don't make of a ton of sense when measuring/laying out in unconstrained directions. The implementation of reverse calls for starting at the far edge and laying out in reverse order; when the direction is unconstrained, "far edge" has no meaning. The current implementation treats the unconstrained "far edge" as zero; this means that the reversed items are starting at zero and laying out into negative X,Y positions.
The best option in the absence of a known constraint is to lay out in reverse order from the near edge; the width of the unconstrained container is just the width of the flex items within it. Since the implementation is already almost doing this, we just do a final pass to adjust the positions of the items into positive X,Y positions.
Draft for now; this needs unit tests.
Issues Fixed
Fixes #7756