[jdk15u-dev] RFR: 8257414: Drag n Drop target area is wrong on high DPI systems

[Olga Mikhaltsova]

I'd like to backport JDK-8257414 to jdk15u for parity with jdk11u.
The original patch applied cleanly.
Tested manually.

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Commit messages:
 - Backport d3398324e9c3944d2f1558ff1becea9ed1d4e8a2

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/21/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=21&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257414
  Stats: 31 lines in 2 files changed: 26 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/21.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/21/head:pull/21

PR: https://git.openjdk.java.net/jdk15u-dev/pull/21