canRestoreExactViewPosition method added to know whether docking system is...

canRestoreExactViewPosition method added to know whether docking system is consistent in view position restoring

dockingcore/src/main/java/fr/soleil/docking/ADockingManager.java

@@ -230,4 +230,11 @@ public abstract class ADockingManager implements PropertyChangeListener {
      */
     public abstract boolean isEnabledDocking();
 
+    /**
+     * Returns whether a view, once closed, is sure to be restored at the exact previous position once shown again
+     * 
+     * @return A <code>boolean</code>
+     */
+    public abstract boolean canRestoreExactViewPosition();
+
 }