Avoid crashing on too many containers

If far too many containers are created, they can become so small that
their size calculations come out negative, leading to crashes on
asserts.

Instead, set a lower bound for sizes and disable the container entirely
if it goes below it, giving whatever space it used to the last
container.

The splits are not recalculated, so currently the effect is that if all
containers have the same width fraction, they keep getting narrower
until at some point they all round to zero and the last container will
be given all the available space.

A better behavior would have been if the additional container did not
contribute to size and fraction calculations at all, but it's an extreme
edge-case, anything is better than crashing, and this is easier to
implement.

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