layout: Ensure that anonymous flex items are properly stored in a BoxSlot
#57199
+32
−0
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When a flex container has text children, those children are wrapped in
an anonymous box and used as flex items. These anonymous boxes must be
stored into
BoxSlots so that their style is repairable duringincremental layout.
Testing: This change includes a new WPT test.
Fixes: #41947.
Reviewed in servo/servo#41951