[jdk17u-dev] RFR: 8283383: [macos] a11y : Screen magnifier shows extra characters (0) at the end JButton accessibility name

[Jonathan Dowland]

Hi all,

This pull request contains a backport of commit [b021d37c](https://github.com/openjdk/jdk/commit/b021d37cec557059e288d5937a73577233b0b172) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Alexander Zuev on 8 Jun 2022 and was reviewed by Sergey Bylokhov and Dmitry Markov.

I wish to backport it for Oracle parity.

Patch applies clean. There's no test in the patch but there is a manual one attached in JBS. WIth Jdk17u-dev, the test demonstrates the erroneous behaviour; after the patch, it is fixed.

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Commit messages:
 - Backport b021d37cec557059e288d5937a73577233b0b172

Changes: https://git.openjdk.org/jdk17u-dev/pull/655/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=655&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8283383
  Stats: 29 lines in 5 files changed: 22 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/655.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/655/head:pull/655

PR: https://git.openjdk.org/jdk17u-dev/pull/655