RFR: 8168388: GetMousePositionTest fails with the message "Mouse position should not be null" [v3]

[Alexander Zuev]

> 8168388: GetMousePositionTest fails with the message "Mouse position should not be null"

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Call dispose() from the test final block. Also added original exception to the unexpected exception handler for easier triage in the future.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6028/files
  - new: https://git.openjdk.java.net/jdk/pull/6028/files/e53239a1..382c31f8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6028&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6028&range=01-02

  Stats: 15 lines in 1 file changed: 8 ins; 7 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6028.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6028/head:pull/6028

PR: https://git.openjdk.java.net/jdk/pull/6028