[jdk17u-dev] RFR: 8339943: Frame not disposed in java/awt/dnd/DropActionChangeTest.java

[Goetz Lindenmaier]

I backport this for parity with 17.0.15-oracle.

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Commit messages:
 - Backport fa502ecd2d1040ee2fe26d0ac5dd547379a0ade7

Changes: https://git.openjdk.org/jdk17u-dev/pull/3139/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3139&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8339943
  Stats: 74 lines in 1 file changed: 40 ins; 17 del; 17 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3139.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3139/head:pull/3139

PR: https://git.openjdk.org/jdk17u-dev/pull/3139