RFR: 8139208: [macosx] Issue with setExtendedState of JFrame

[Alisen Chung]

Swapped order of showing frame and managing extended frame state.

-------------

Commit messages:
 - init commit

Changes: https://git.openjdk.org/jdk/pull/15236/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15236&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8139208
  Stats: 84 lines in 1 file changed: 45 ins; 38 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15236.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15236/head:pull/15236

PR: https://git.openjdk.org/jdk/pull/15236