RFR: 8139208: [macosx] Issue with setExtendedState of JFrame [v6]

[Alisen Chung]

> Swapped order of showing frame and managing extended frame state.

Alisen Chung has updated the pull request incrementally with four additional commits since the last revision:

 - add copyright
 - update test
 - update test
 - update test

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15236/files
  - new: https://git.openjdk.org/jdk/pull/15236/files/50abf4bd..cc575aa8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15236&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15236&range=04-05

  Stats: 63 lines in 1 file changed: 38 ins; 20 del; 5 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