no need to adapt splitpane when expanded state did not change

flyscan-gui/src/main/java/fr/soleil/flyscan/gui/view/component/ConfigurationTree.java

@@ -89,6 +89,7 @@ public class ConfigurationTree extends ExpandableTree {
 
     @Override
     protected void setExpandedState(TreePath path, boolean state) {
+        boolean changed = (!hasBeenExpanded(path)) || (state != isExpanded(path));
         super.setExpandedState(path, state);
         // Hack to update JPopupMenu best size, when this tree is in a JMenu.
         revalidate();
@@ -97,6 +98,7 @@ public class ConfigurationTree extends ExpandableTree {
         while (parent != null && !(parent instanceof JPopupMenu)) {
             parent = parent.getParent();
         }
+        if (changed) {
             if (parent instanceof JPopupMenu) {
                 JPopupMenu window = (JPopupMenu) parent;
                 if (window.isShowing()) {
@@ -115,6 +117,7 @@ public class ConfigurationTree extends ExpandableTree {
                 }
             }
         }
+    }
 
     // ///////////// //
     // Inner classes //