RFR: 8306959: (bf) CharBuffer.append(CharSequence, int, int) throws BufferOverflowException where IndexOutOfBoundsException expected [v4]

[Brian Burkhalter]

> In `java.nio.CharBuffer::append(CharSequence csq, int start, int end)`, the `start` and `end` parameters need to be validated against the preconditions specified by `Appendable::append(CharSequence csq, int start, int end)` before they are used to determine whether a buffer overflow condition exists.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8306959: Add non-char generated test to retain line number parity

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13680/files
  - new: https://git.openjdk.org/jdk/pull/13680/files/15b92089..4e4fc8eb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13680&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13680&range=02-03

  Stats: 348 lines in 6 files changed: 342 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/13680.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13680/head:pull/13680

PR: https://git.openjdk.org/jdk/pull/13680