Index: trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java	(revision 10645)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/relation/GenericRelationEditor.java	(revision 10646)
@@ -732,4 +732,7 @@
     @Override
     public void setVisible(boolean visible) {
+        if (isVisible() == visible) {
+            return;
+        }
         if (visible) {
             tagEditorPanel.initAutoCompletion(getLayer());