[jdk21u-dev] RFR: 8366844: Update and automate MouseDraggedOriginatedByScrollBarTest.java

[Goetz Lindenmaier]

I  backport this for parity with 21.0.11-oracle.

I could patch this clean, don't see why this did not work with the /backport command.

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Commit messages:
 - backport f1ee1b4a3d7c47b6f61b36b78504e3ec997a925a

Changes: https://git.openjdk.org/jdk21u-dev/pull/2474/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2474&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366844
  Stats: 58 lines in 1 file changed: 31 ins; 1 del; 26 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2474.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2474/head:pull/2474

PR: https://git.openjdk.org/jdk21u-dev/pull/2474