RFR: 8281535: Create a regression test for JDK-4670051 [v2]

[Manukumar V S]

> Create a regression test for [JDK-4670051](https://bugs.openjdk.java.net/browse/JDK-4670051) which checks whether JSpinner with a SpinnerDateModel exactly spins the field where cursor is there.
> I have updated the testing details in the comment section of JDK-8281535.

Manukumar V S has updated the pull request incrementally with one additional commit since the last revision:

  Review comments fixed: Updated copyright, formatting changes, changed compareDates(), renamed some variables and methods.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7404/files
  - new: https://git.openjdk.java.net/jdk/pull/7404/files/de5ef09d..887f3158

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7404&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7404&range=00-01

  Stats: 123 lines in 1 file changed: 34 ins; 55 del; 34 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7404.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7404/head:pull/7404

PR: https://git.openjdk.java.net/jdk/pull/7404