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

[Manukumar V S]

Call Robot.waitForIdle() after createUI and before getting the location of the JSpinner component in the test: javax/swing/JSpinner/4515999/JSpinnerMouseAndKeyPressTest.java.

This is needed to ensure all the events for creating and displaying the frame are processed before interacting with the components on the screen.

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Commit messages:
 - 8282147: waitForIdle after creating frame in JSpinnerMouseAndKeyPressTest.java

Changes: https://git.openjdk.java.net/jdk/pull/7545/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7545&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282147
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7545.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7545/head:pull/7545

PR: https://git.openjdk.java.net/jdk/pull/7545