BestFirstSearch: relax cost check w/ optimal token #4854
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Rather than requiring that state cost remain unchanged with the latest split, let's limit it to checking that the original cost of the split (before any penalties may have been applied) is zero, and that the state does not overflow. This leads to extremely rare formatting changes (none on scala, spark, scalafmt, scalameta repos) and on average over a 5% improvement in the BestFirstSearch algorithm efficiency. This approach protects optimal-token intentions from penalties which are designed to rank different states, and is a follow-on to scalameta#4851.
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Rather than requiring that state cost remain unchanged with the latest split, let's limit it to checking that the original cost of the split (before any penalties may have been applied) is zero, and that the state does not overflow.
This leads to extremely rare formatting changes (none on scala, spark, scalafmt, scalameta repos) and on average over a 5% improvement in the BestFirstSearch algorithm efficiency.
This approach protects optimal-token intentions from penalties which are designed to rank different states, and is a follow-on to #4851.