[jdk17u-dev] RFR: 8282147: [TESTBUG] waitForIdle after creating frame in JSpinnerMouseAndKeyPressTest.java

[Goetz Lindenmaier]

I backport this for parity with 17.0.17-oracle.

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Commit messages:
 - Backport bdae1d87c16423878e4dcc8a0e87806d77bb5256

Changes: https://git.openjdk.org/jdk17u-dev/pull/3772/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3772&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8282147
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3772.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3772/head:pull/3772

PR: https://git.openjdk.org/jdk17u-dev/pull/3772