The fix for RT-39813 has caused a failure in our system unit tests on Mac. This is a regression that must be fixed soon.

com.sun.javafx.tk.quantum.CloseWindowTest > test2 FAILED
    java.lang.NullPointerException
        at com.sun.javafx.tk.quantum.WindowStage.requestToFront(WindowStage.java:824)
        at com.sun.javafx.tk.quantum.WindowStage.setVisible(WindowStage.java:449)
        at javafx.stage.Window$9.invalidated(Window.java:860)
        at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
        at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
        at javafx.stage.Window.setShowing(Window.java:910)
        at javafx.stage.Window.hide(Window.java:935)
        at com.sun.javafx.tk.quantum.CloseWindowTest.lambda$null$215(CloseWindowTest.java:118)

com.sun.javafx.tk.quantum.CloseWindowTest > test3 FAILED
    java.lang.NullPointerException
        at com.sun.javafx.tk.quantum.WindowStage.setEnabled(WindowStage.java:811)
        at com.sun.javafx.tk.quantum.WindowStage.setVisible(WindowStage.java:438)
        at javafx.stage.Window$9.invalidated(Window.java:860)
        at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
        at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
        at javafx.stage.Window.setShowing(Window.java:910)
        at javafx.stage.Window.hide(Window.java:935)
        at com.sun.javafx.tk.quantum.CloseWindowTest.lambda$null$217(CloseWindowTest.java:147)

com.sun.javafx.tk.quantum.CloseWindowTest > test4 FAILED
    java.lang.NullPointerException
        at com.sun.javafx.tk.quantum.WindowStage.requestToFront(WindowStage.java:824)
        at com.sun.javafx.tk.quantum.WindowStage.setVisible(WindowStage.java:449)
        at javafx.stage.Window$9.invalidated(Window.java:860)
        at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
        at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
        at javafx.stage.Window.setShowing(Window.java:910)
        at javafx.stage.Window.hide(Window.java:935)
        at com.sun.javafx.tk.quantum.CloseWindowTest.lambda$null$219(CloseWindowTest.java:180)

com.sun.javafx.tk.quantum.CloseWindowTest > test1 FAILED
    java.lang.NullPointerException
        at com.sun.javafx.tk.quantum.WindowStage.requestToFront(WindowStage.java:824)
        at com.sun.javafx.tk.quantum.WindowStage.setVisible(WindowStage.java:449)
        at javafx.stage.Window$9.invalidated(Window.java:860)
        at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:109)
        at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:144)
        at javafx.stage.Window.setShowing(Window.java:910)
        at javafx.stage.Window.hide(Window.java:935)
        at com.sun.javafx.tk.quantum.CloseWindowTest.lambda$null$219(CloseWindowTest.java:180)