RFR: 8282640: Create a test for JDK-4740761 [v3]

[Srinivas Mandalika]

> Create a test for [JDK-4740761](https://bugs.openjdk.java.net/browse/JDK-4740761)
> 
> The issue observed is in a JFrame with a JTextField and a JScrollPane which contains focused component. When the JScrollPane was
> is removed from its parent, focus stays with the the scroller
> of the removed JScrollPane, instead of moving to the TextField.
> 
> The test verifies the same - i.e. it verifies that the removal of the scrollpane moves the focus to the JTextField present in the JFrame.
> 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:

  Review comments Fixed: scrollpane accessed on EDT, Copyright Year updated, volatile focussedComponentName

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7686/files
  - new: https://git.openjdk.java.net/jdk/pull/7686/files/44016225..20128b9b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7686&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7686&range=01-02

  Stats: 21 lines in 1 file changed: 11 ins; 3 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7686.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7686/head:pull/7686

PR: https://git.openjdk.java.net/jdk/pull/7686