Backport "Test chars safely when highlighting" to 3.3 LTS #381
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The arrow test at lastOffset - 3 is out-of-range when highlighting, which parses a snippet of source. Always check lower bound in testChar. Don't check as initial condition in testChars because it recurses. [Cherry-picked fb6cc9b][modified]
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Backports scala#22918 to the 3.3.7.
PR submitted by the release tooling.