[jdk15u-dev] RFR: 8261231: Windows IME was disabled after DnD operation

[Yuri Nesterenko]

bug reproduced in the current state jdk15u-dev (with JDK-8252470) and fix worked there as expected.

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Commit messages:
 - Backport d6d5d9bf2f1a3343af6cf30a9d06a1f1b5f764ad

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/15/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=15&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261231
  Stats: 5 lines in 1 file changed: 3 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/15.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/15/head:pull/15

PR: https://git.openjdk.java.net/jdk15u-dev/pull/15