[jfx25u] RFR: 8372453: [macOS] Iconifying owner may not iconify owned window

[Martin Fox]

8372453: [macOS] Iconifying owner may not iconify owned window

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Commit messages:
 - Backport 6234c07e0e7ef84145e8a17407bf983ddba13d05

Changes: https://git.openjdk.org/jfx25u/pull/38/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx25u&pr=38&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372453
  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx25u/pull/38.diff
  Fetch: git fetch https://git.openjdk.org/jfx25u.git pull/38/head:pull/38

PR: https://git.openjdk.org/jfx25u/pull/38