RFR: 8295774 : Write a test to verify that List Item selection events.

[ravi gupta]

This testcase verify that List Item selection via mouse/keys generates ItemEvent/ActionEvent appropriately.

a. Single click on the list generate ItemEvent and double click on item generates ActionEvent.
b. UP/DOWN keys on the list generate ItemEvent and enter key on item generates ActionEvent.

Testing:
Tested using Mach5(20 times per platform) in macos,linux and windows and got all pass.

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Commit messages:
 - 8295774 : Write a test to verify that List Item selection events.

Changes: https://git.openjdk.org/jdk/pull/10899/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10899&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295774
  Stats: 193 lines in 1 file changed: 193 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10899.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10899/head:pull/10899

PR: https://git.openjdk.org/jdk/pull/10899