RFR: 8356814: LineBreakMeasurer.nextLayout() slower than necessary when no break needed

[Daniel Gredler]

On Tue, 13 May 2025 20:49:59 GMT, Phil Race <prr at openjdk.org> wrote:

> Looks OK. Testing passes. My only concern would have been if these are mutable, but they aren't Unless something casts to a known sub-class that is mutable, but I don't know think that is the case.

It doesn't look like it, but let me know if you'd like me to make `ExtendedTextSourceLabel` final and make all the instance variables private, just to tighten things up.

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PR Comment: https://git.openjdk.org/jdk/pull/25193#issuecomment-2879071641