<Swing Dev> RFR: 8202880: Test javax/swing/JPopupMenu/8075063/ContextMenuScrollTest.java fails [v3]

[Prasanta Sadhukhan]

> This test was unstable in linux in nightly testing. Modified to move the frame to center of screen so that the left-taskbar of linux doesn't interfere with the mouse movement along with delay after frame is visible to make it more stable. 
> Mach5 job running for several iterations on all platforms is ok. Link in JBS.

Prasanta Sadhukhan has updated the pull request incrementally with three additional commits since the last revision:

 - Review fix
 - Revert "Address review comments"
   
   This reverts commit cb12e5bf447b0922fe601c11bbceb2200904b1c3.
 - Address review comments

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2061/files
  - new: https://git.openjdk.java.net/jdk/pull/2061/files/bc7ef81f..9f3bbbf6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2061&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2061&range=01-02

  Stats: 23 lines in 1 file changed: 5 ins; 9 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2061.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2061/head:pull/2061

PR: https://git.openjdk.java.net/jdk/pull/2061