RFR: 8297296: java/awt/Mouse/EnterExitEvents/DragWindowTest.java fails with "No MouseReleased event on label!" [v4]

[Alisen Chung]

> Test was run on mac, windows, linux 50 times and passed after change
> Before fix, test fails about once every 50 runs on linux and windows platforms

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  setLocationRelativeTo set to null

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11425/files
  - new: https://git.openjdk.org/jdk/pull/11425/files/8f0e0e71..fb846a79

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11425&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11425&range=02-03

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11425.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11425/head:pull/11425

PR: https://git.openjdk.org/jdk/pull/11425