RFR: 8282937: Write a regression test for JDK-4820080 [v2]

[Manukumar V S]

> Write a regression test for [JDK-4820080](https://bugs.openjdk.java.net/browse/JDK-4820080) : RFE: Cannot Change the JSplitPane Divider Color while dragging
> 
> Issue(as per bug description):
> I want to change the color of the JSplitPane divider. I
> opened the code and found that, the color is hard coded to
> darkGray while one is dragging the splitDivider. I have an
> application where the components on SplitPane have black
> background, So when i drag I can not see the split getting
> dragged. Can some one fix this, by externelising the
> SplitDivider color so that it can be changed at run time.
> 
> Testing:
> Java 1.4.1 -> Test Failed.
> $ ./j2sdk1.4.1/bin/java JSplitPaneDragColorTest
> Metal uses correct drag color false
> CDE/Motif uses correct drag color false
> Windows uses correct drag color false
> Test Failed.
> 
> Java 1.5.0 -> Test Failed.
> $ ./jdk1.5.0/bin/java JSplitPaneDragColorTest
> Metal uses correct drag color true
> Windows uses correct drag color true
> Windows Classic uses correct drag color true
> Test Passed.

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

  Review comments fixed: Formatting changes, split long lines

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7803/files
  - new: https://git.openjdk.java.net/jdk/pull/7803/files/b1c14ff7..afb0a2b0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7803&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7803&range=00-01

  Stats: 26 lines in 1 file changed: 11 ins; 0 del; 15 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7803.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7803/head:pull/7803

PR: https://git.openjdk.java.net/jdk/pull/7803