RFR: 8315986: javax/swing/JMenuItem/4654927/bug4654927.java: component must be showing on the screen to determine its location [v4]

[Prasanta Sadhukhan]

> Test was run without waiting for UI to be made visible leading to IllegalComponentStateException.
> Used robot.delay consistent with other headful tests to made the test wait after UI is created and shown.
> 
> Test passed in several iterations in all platforms. Link in JBS

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  jcheck

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15677/files
  - new: https://git.openjdk.org/jdk/pull/15677/files/f270b9e5..291706fd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15677&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15677&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15677.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15677/head:pull/15677

PR: https://git.openjdk.org/jdk/pull/15677