RFR: 8374293: Jshell throws an error and crashes when using keyword Public [v2]

[Lei Zhu]

> `jdk.jshell.SourceCodeAnalysis#highlights` should not return overlapping highlights, so use `TreeSet` for deduplication and sorting.

Lei Zhu has updated the pull request incrementally with one additional commit since the last revision:

  8374293

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29018/files
  - new: https://git.openjdk.org/jdk/pull/29018/files/81b82f5f..ef703e32

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29018&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29018&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29018.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29018/head:pull/29018

PR: https://git.openjdk.org/jdk/pull/29018