title: ButtonBar changes position when Stage is resizable
body: <p>I have a BoarderPane (decoration: UTILITY) where a ButtonBar with two buttons is put to BOTTOM:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  
  &lt;?import javafx.geometry.Insets?&gt;
  &lt;?import javafx.scene.control.Button?&gt;
  &lt;?import javafx.scene.control.ButtonBar?&gt;
  &lt;?import javafx.scene.layout.BorderPane?&gt;
  
  &lt;BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="pw.yaps.client.jfx.view.SettingsViewController"&gt;
     &lt;bottom&gt;
        &lt;ButtonBar BorderPane.alignment="CENTER"&gt;
          &lt;buttons&gt;
            &lt;Button disable="true" mnemonicParsing="false" text="OK" /&gt;
              &lt;Button cancelButton="true" mnemonicParsing="false" onAction="#handleCancelAction" text="Cancel" /&gt;
          &lt;/buttons&gt;
           &lt;padding&gt;
              &lt;Insets bottom="12.0" right="12.0" /&gt;
           &lt;/padding&gt;
        &lt;/ButtonBar&gt;
     &lt;/bottom&gt;
  &lt;/BorderPane&gt;
  </code></pre>
  
  <p>When the Stage is NOT resizable the layout looks like that:<br>
  <a href="https://i.stack.imgur.com/HD1kA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HD1kA.png" alt="enter image description here"></a><br>
  but when I set it resizable it looks different:<br>
  <a href="https://i.stack.imgur.com/VnZOU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VnZOU.png" alt="enter image description here"></a></p>
  
  <p>How can this behavior be avoided?</p>