[jdk8u-dev] RFR: 8274597: Some of the dnd tests time out and fail intermittently

[Taizo Kurashige]

Hi,

This is a backport of JDK-8274597: Some of the dnd tests time out and fail intermittently

Original patch applies cleanly except for path changes. This PR depends on #652 . So #652 shoud be integrated first.

Testing: AcceptDropMultipleTimes.java, MissedDragExitTest.java, ExtraDragEnterTest.java and MissingDragExitEventTest.java pass on Windows11

Thanks.

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Depends on: https://git.openjdk.org/jdk8u-dev/pull/652

Commit messages:
 - Backport 669ac611b269bbda5c53d84173e5c9d0eb4ce919

Changes: https://git.openjdk.org/jdk8u-dev/pull/653/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=653&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8274597
  Stats: 159 lines in 4 files changed: 107 ins; 12 del; 40 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/653.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/653/head:pull/653

PR: https://git.openjdk.org/jdk8u-dev/pull/653