WebKit export of https://bugs.webkit.org/show_bug.cgi?id=245194

[sammygill]

When computing the transferred size suggestion for the minimum size of flex items, we need to use the intrinsic aspect ratio and the definite cross size. From the CSS Flexbox Module:

If a single-line flex container has a definite cross size, the outer cross size of any stretched flex items is the flex container’s inner cross size (clamped to the flex item’s min and max cross size) and is considered definite.

[wpt-pr-bot]

This patch has been exported from WebKit; it will be approved automatically once the downstream patch is r+.