RFR: 8297296: java/awt/Mouse/EnterExitEvents/DragWindowTest.java fails with "No MouseReleased event on label!" [v3]

[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 with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' of https://github.com/openjdk/jdk into 8297296
 - fixed imports, changed robot autodelay and added delay after creating gui
 - changed robot autodelay to 250

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11425/files
  - new: https://git.openjdk.org/jdk/pull/11425/files/0e69811d..8f0e0e71

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11425&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11425&range=01-02

  Stats: 45484 lines in 1002 files changed: 17794 ins; 21203 del; 6487 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