[jdk26] RFR: 8374382: (aio) AsynchronousFileChannel writes wrong content using heap ByteBuffer when position != 0

[Alan Bateman]

This pull request contains a clean backport of changeset https://github.com/openjdk/jdk/commit/d9bd300c6eddfd30a83e53e7ae03c47ea43a9e08 from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

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Commit messages:
 - Backport d9bd300c6eddfd30a83e53e7ae03c47ea43a9e08

Changes: https://git.openjdk.org/jdk/pull/29015/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29015&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374382
  Stats: 191 lines in 2 files changed: 189 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29015.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29015/head:pull/29015

PR: https://git.openjdk.org/jdk/pull/29015