[jdk21u-dev] RFR: 8162380: [TEST_BUG] MouseEvent/.../AltGraphModifierTest.java has only "Fail" button

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

Resolved ProblemList, probably clean anyways.

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Commit messages:
 - backport 34c3ac0316dbd29ae670db51bd9230a1e77382d9

Changes: https://git.openjdk.org/jdk21u-dev/pull/2407/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2407&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8162380
  Stats: 244 lines in 2 files changed: 31 ins; 200 del; 13 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2407.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2407/head:pull/2407

PR: https://git.openjdk.org/jdk21u-dev/pull/2407