<Swing Dev> RFR: 8202880: Test javax/swing/JPopupMenu/8075063/ContextMenuScrollTest.java fails [v2]

[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 one additional commit since the last revision:

  Address review comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2061/files
  - new: https://git.openjdk.java.net/jdk/pull/2061/files/ca7e5589..bc7ef81f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2061&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2061&range=00-01

  Stats: 15 lines in 2 files changed: 6 ins; 7 del; 2 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