RFR: 8226938: [TEST_BUG]GTK L&F: There is no Details button in FileChooser Dialog [v2]

[Abhishek Kumar]

> Applet test converted to main based manual test and open sourced.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Test instruction update

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21418/files
  - new: https://git.openjdk.org/jdk/pull/21418/files/52feb484..c4d96352

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21418&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21418&range=00-01

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21418.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21418/head:pull/21418

PR: https://git.openjdk.org/jdk/pull/21418