git: openjdk/jfx: jfx15: 8248490: [macOS] Undecorated stage does not minimize

[Kevin Rushforth]

Changeset: 2f4666a7
Author:    Kevin Rushforth <kcr at openjdk.org>
Date:      2020-07-15 13:30:45 +0000
URL:       https://git.openjdk.java.net/jfx/commit/2f4666a7

8248490: [macOS] Undecorated stage does not minimize

Reviewed-by: arapte, aghaisas

! modules/javafx.graphics/src/main/native-glass/mac/GlassWindow.m
+ tests/system/src/test/java/test/robot/javafx/stage/IconifyTest.java