When calculating e.g the min-content height of some box, we would only
set its containing block's height to 0 in the temporary formatting
state. The containing block width was not touched at all.
This patch aims to do a bit better by resolving indefinite containing
block sizes to INFINITY before performing intrinsic sizing. We should
probably also find a way to resolve definite containing block sizes,
but I'll leave that for our future selves.
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