[jdk17u-dev] RFR: 8366844: Update and automate MouseDraggedOriginatedByScrollBarTest.java

[Goetz Lindenmaier]

I backport this for parity with 17.0.19-oracle

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Commit messages:
 - Backport f1ee1b4a3d7c47b6f61b36b78504e3ec997a925a

Changes: https://git.openjdk.org/jdk17u-dev/pull/4185/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4185&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/jdk17u-dev/pull/4185.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4185/head:pull/4185

PR: https://git.openjdk.org/jdk17u-dev/pull/4185