RFR: 8295707: Create a regression test for JDK-7184401 [v2]

[Srinivas Mandalika]

> 8295707: Create a regression test for JDK-7184401
> 
> JDK-7184401 - JDk7u6 : Missing main menu bar in Netbeans after fix for 7162144
> Above bug got introduced due to a fix for [JDK-7162144](https://bugs.openjdk.java.net/browse/JDK-7162144). 
> The issue was observed on the netbeans UI. 
> The test below recreates a standalone test to mimic the failure reported in Netbeans in [JDK-7184401](https://bugs.openjdk.java.net/browse/JDK-7184401) and verifies that it is working as expected after it got fixed via [JDK-7189350](https://bugs.openjdk.java.net/browse/JDK-7189350))
> 
> The Test attempts to reproduce specific behavior of NetBeans at the certain toolbar creation stage. Widgets are created on EDT; Another code posts some events to them on EDT; From another thread some code calls explicitly edt.interrupt().
> Before this got fixed, events from a second code got lost.
> 
> This review is for migrating tests from a closed test suite to open.
> Testing:
> 1.Tested the code on jdk7u6 to reproduce the issue - the UI hangs when run on this build.
> 2. Tested the code on jdk7u361 b01 to validate the fix - the test passed.
> 3.Mach5 Testing(40 times per platform) in macos x64, linux x64 and windows x64 - the .results are clean

Srinivas Mandalika has updated the pull request incrementally with one additional commit since the last revision:

  Fixed Review Comments: Removed redundant code

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/10784/files
  - new: https://git.openjdk.org/jdk/pull/10784/files/610841fe..ad0a6240

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10784&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10784&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10784.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10784/head:pull/10784

PR: https://git.openjdk.org/jdk/pull/10784