A box-like container that can wrap widgets.
Background: Palette has a few in exalm/patterns#24 and exalm/patterns#25
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Docs -
Tests -
Minimum/natural policy switcher -
Clean up the code wrt overflows (situations where 0 widgets fit into a line and we squeeze 1 and let it go out of bound)
CC @jwestman though this one isn't related to that little widget we made long time ago. Still might be useful for similar situations