RFR: JDK-8282933: Create a test for JDK-4529616 [v2]

[Srinivas Mandalika]

> JDK-8282933: Create a test for JDK-4529616 
> AccessibleJTableCell.isShowing() returns false when the cell is actually on
> the screen.
> The test validates the fix for the above issue by verifying that the isShowing call returns true when invoked via the  accessiblity context.
> This review is for migrating tests from a closed test suite to open.

Srinivas Mandalika has updated the pull request incrementally with one additional commit since the last revision:

  frame dispose call on EDT

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7783/files
  - new: https://git.openjdk.java.net/jdk/pull/7783/files/c1ba7b68..787ad251

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7783&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7783&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7783.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7783/head:pull/7783

PR: https://git.openjdk.java.net/jdk/pull/7783