Fix: don't inline level prefix if breaks occurred inside #85
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Before this PR
A level managed to get itself "inlined" as far as the formatter was concerned, even though a break was snuck in inside one of its inner levels.
After this PR
==COMMIT_MSG==
When inlining a level's leading docs, check that no breaks were introduced more robustly.
We already did some validation that the leading docs
(1) don't contain forced breaks, and
(2) can fit onto the current line
However with the new logic added in #71, inner levels might decide to break even when the above two conditions are satisfied.
We guard against this by checking whether the state after the inlining of leading docs has recorded new lines, which would be caused by an inner break being taken.
==COMMIT_MSG==
Possible downsides?