<Swing Dev> RFR: 8164484: Unity, JTable cell editor, javax/swing/JComboBox/6559152/bug6559152.java

[Prasanta Sadhukhan]

This test was problemlisted for linux as it fails only on ubuntu18.04 in mach5 nightly testing. It was infact passing on ubuntu19.10, 20.04 and 20.10 so it was test specific issue. Made appropriate stability fix by adding waitForIdle() at appropriate location.
Mach5 job running specifically on ubuntu18.04 and all other platforms is ok. Link in JBS.

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Commit messages:
 - 8164484: Unity, JTable cell editor, javax/swing/JComboBox/6559152/bug6559152.java

Changes: https://git.openjdk.java.net/jdk/pull/2192/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2192&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8164484
  Stats: 7 lines in 2 files changed: 4 ins; 3 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2192.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2192/head:pull/2192

PR: https://git.openjdk.java.net/jdk/pull/2192