Re: [csswg-drafts] [css-flexbox] Undefined target main size in Resolving Flexible Lengths (#5179)

91bab66ac6081f971c07f0d0007287439b04e6f7 changed the definition of *initial free space* to use "target main sizes" instead of:

> For frozen items, use their outer *target main size*; for other items, use their outer *flex base size*.

For the initial free space this is indeed the same, but later on this algorithm is referenced:

> Calculate the **remaining free space** as for *initial free space*, above.

So this looks like a normative change in the computation of *remaining free space*.

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