RFR: 8322239: [macos] a11y : java.lang.NullPointerException is thrown when focus is moved on the JTabbedPane [v2]

[Alexander Zuev]

> Add null check for the Aqua LnF situation when tab is hidden die to the tabs overflow.

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Handling of InvalidComponentStateException added
  
  Added regression test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17736/files
  - new: https://git.openjdk.org/jdk/pull/17736/files/dfab2416..357b8665

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17736&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17736&range=00-01

  Stats: 105 lines in 2 files changed: 104 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17736.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17736/head:pull/17736

PR: https://git.openjdk.org/jdk/pull/17736