[jfx17u] RFR: 8087557: [Win] [Accessibility, Dialogs] Alert Dialog content is not fully read by Screen Reader [v2]

[Ambarish Rapte]

> Backport this a11y fix to jfx17u.
> This is not a clean backport. The source code changes apply cleanly but there was a conflict in test file.
> The test `DialogTest.java` file does not exist in jfx17u source.
> The file is now added but only with one test that was added as part of this fix to mainline, and other pre-existing tests are removed.
> Tested that fix works as expected on Windows and macOS

Ambarish Rapte has updated the pull request incrementally with one additional commit since the last revision:

  Correct @since

-------------

Changes:
  - all: https://git.openjdk.org/jfx17u/pull/91/files
  - new: https://git.openjdk.org/jfx17u/pull/91/files/7c2b9a71..64377b7a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx17u&pr=91&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx17u&pr=91&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx17u/pull/91.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/91/head:pull/91

PR: https://git.openjdk.org/jfx17u/pull/91