as part of RT-38363 it was determined that owned and modal windows should not have min/max decorations.
This will help meet user expectations, after all minimizing a modal window reveals a unresponsive parent.


diff --git a/modules/graphics/src/main/java/com/sun/javafx/tk/quantum/WindowStage.java b/modules/graphics/src/main/java/com/sun/javafx/tk/quantum/WindowStage.java
--- a/modules/graphics/src/main/java/com/sun/javafx/tk/quantum/WindowStage.java
+++ b/modules/graphics/src/main/java/com/sun/javafx/tk/quantum/WindowStage.java
@@ -178,6 +178,9 @@
                         case DECORATED:
                             windowMask |=
                                     Window.TITLED | Window.CLOSABLE | Window.MINIMIZABLE | Window.MAXIMIZABLE;
+ if (ownerWindow != null || modality != Modality.NONE) {
+ windowMask &= ~(Window.MINIMIZABLE | Window.MAXIMIZABLE);
+ }
                             resizable = true;
                             break;
                         case UTILITY: