Ian Hickson 47f5c6f2e0 Add even more careful checks around BoxConstraints (#3243)
I ran into a case where I was setting minHeight=∞ and then calling
layout() with that constraint, which is all kinds of bad. To try to
catch this earlier, this patch now provides a way to catch constraints
that are requiring infinite values.

We don't _always_ check this because there are valid uses for
BoxConstraints.biggest, e.g. as an additionalConstraint.
2016-04-11 11:10:11 -07:00
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