[jdk15u-dev] Integrated: 8262446: DragAndDrop hangs on Windows

[Yuri Nesterenko]

backporting as follow-up to 8232114. Applies clean.

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Commit messages:
 - Backport bf9b74d18767619f0765ed1435e35e28077a4220

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/16/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=16&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262446
  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/16.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/16/head:pull/16

PR: https://git.openjdk.java.net/jdk15u-dev/pull/16