RFR: JDK-8016524: [macosx] Bottom line is not visible for JTableHeader [v4]

[Harshitha Onkar]

> A new test case was added to test the fix as there was no corresponding test case present for this issue previously.

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  tagged test case as mac only

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7219/files
  - new: https://git.openjdk.java.net/jdk/pull/7219/files/90a5a7aa..516985d5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7219&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7219&range=02-03

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7219.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7219/head:pull/7219

PR: https://git.openjdk.java.net/jdk/pull/7219