### Eclipse Workspace Patch 1.0
#P JMapViewer
Index: src/org/openstreetmap/gui/jmapviewer/checkBoxTree/CheckBoxNodeEditor.java
===================================================================
--- src/org/openstreetmap/gui/jmapviewer/checkBoxTree/CheckBoxNodeEditor.java	(revision 36494)
+++ src/org/openstreetmap/gui/jmapviewer/checkBoxTree/CheckBoxNodeEditor.java	(working copy)
@@ -25,6 +25,9 @@
     private final CheckBoxNodeRenderer renderer = new CheckBoxNodeRenderer();
 
     private final CheckBoxTree theTree;
+    
+    // Use the listener field to allow for targeted removal later.
+    private final ItemListener stopEditingListener = e -> stopCellEditing();
 
     public CheckBoxNodeEditor(final CheckBoxTree tree) {
         theTree = tree;
@@ -82,6 +85,7 @@
             renderer.getTreeCellRendererComponent(tree, value, true, expanded, leaf,
                 row, true);
 
+        /*
         // editor always selected / focused
         final ItemListener itemListener = itemEvent -> {
             if (stopCellEditing()) {
@@ -88,9 +92,12 @@
                 fireEditingStopped();
             }
         };
+        */
         if (editor instanceof CheckBoxNodePanel) {
             final CheckBoxNodePanel panel = (CheckBoxNodePanel) editor;
-            panel.check.addItemListener(itemListener);
+            // Remove the old listener before adding a new one (or the same one) to prevent multiple calls.
+            panel.check.removeItemListener(stopEditingListener);
+            panel.check.addItemListener(stopEditingListener);
         }
 
         return editor;