[jdk21u-dev] RFR: 8356752: Log mouse enter and exit events for debugging

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport ab8c808ed8ebec4f70141ee31fbaf312fccf7fa4

Changes: https://git.openjdk.org/jdk21u-dev/pull/2308/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2308&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8356752
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2308.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2308/head:pull/2308

PR: https://git.openjdk.org/jdk21u-dev/pull/2308