Merge pull request #472 from MarcoBl96/3.x

Unsaved-changes dialog wrong behavior when closed by title bar close button

Author: martinbluehweis

modules/ui/org.eclipse.fx.ui.dialogs/src/main/java/org/eclipse/fx/ui/dialogs/Dialog.java

@@ -260,6 +260,7 @@ protected Stage create() {
 		stage.setTitle(this.title);
 		stage.initOwner(this.parent);
 		stage.initModality(getModality());
+		stage.setOnCloseRequest( evt -> this.setReturnCode( CANCEL_BUTTON ) );
 		Parent content = createContents();
 
 		Pane rootContainer = getCustomWindowPane();