RFR: 8225131: Test DragSourceMotionListenerTest.java fails on Windows [v3]

[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 two additional commits since the last revision:

 - Remove blank space
 - Revert indentations

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27283/files
  - new: https://git.openjdk.org/jdk/pull/27283/files/648ec70b..8eeacdd6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27283&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27283&range=01-02

  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 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