[jdk21u-dev] RFR: 8340978: Open source few DnD tests - Set6

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport 32f817a46068b61d599b714a4480e3ea5d6e9050

Changes: https://git.openjdk.org/jdk21u-dev/pull/1582/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1582&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340978
  Stats: 647 lines in 5 files changed: 647 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1582.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1582/head:pull/1582

PR: https://git.openjdk.org/jdk21u-dev/pull/1582