Re: [csswg-drafts] [css-grid-1] Distribution of intrinsic sizes according to flex factors doesn't handle sum < 1 (#6078)

Just some math, in case someone finds it useful.
When distributing among `n` tracks, the `i`-th one gets this fraction of the space:

 - If no flex tracks (equal distribution): `1 / n`
 - If `s ≥ 1`: `fⁱ / s`
 - If `0 ≤ s < 1`: `fⁱ + (1-s)/n`

where `fⁱ` is the flex fraction of the`i`-th track, and `s = ∑fⁱ` is the sum of flex fractions.

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