RFR: 8225131: Test DragSourceMotionListenerTest.java fails on Windows [v2]

[Tejesh R]

> Test is failing frequently on mach5 machines. I have fixed it with stabilizations and moved the frame to center of the screen. After the fix several runs were made on mach5 and no failures were seen.

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  Review fix

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27283/files
  - new: https://git.openjdk.org/jdk/pull/27283/files/8828f6bf..648ec70b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27283&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27283&range=00-01

  Stats: 14 lines in 1 file changed: 0 ins; 12 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27283.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27283/head:pull/27283

PR: https://git.openjdk.org/jdk/pull/27283