diff --git a/code/mindmap-panel/src/main/java/com/mindolph/mindmap/MindMapView.java b/code/mindmap-panel/src/main/java/com/mindolph/mindmap/MindMapView.java
index 3cfa4145..03cc4c88 100644
--- a/code/mindmap-panel/src/main/java/com/mindolph/mindmap/MindMapView.java
+++ b/code/mindmap-panel/src/main/java/com/mindolph/mindmap/MindMapView.java
@@ -1661,12 +1661,14 @@ public void cut() {
     public boolean copyTopicsToClipboard(List<TopicNode> topics, boolean cut) {
         boolean result = false;
         this.endEdit(null, false);
-        if (topics.size() > 0) {
+        if (!topics.isEmpty()) {
             Clipboard clipboard = Clipboard.getSystemClipboard();
             ClipboardContent clipboardContent = new ClipboardContent();
             ClipboardTopicsContainer container = new ClipboardTopicsContainer(topics.toArray(new TopicNode[]{}));
             try {
-                clipboardContent.putString(ClipboardTopicsContainer.convertTopics(topics));
+                String text = ClipboardTopicsContainer.convertTopics(topics);
+                if (log.isTraceEnabled()) log.trace("Text to clipboard: '%s'".formatted(text));
+                clipboardContent.putString(text);
                 clipboardContent.put(MMD_DATA_FORMAT, container);
             } catch (Exception e) {
                 throw new RuntimeException(e);
diff --git a/code/mindmap-panel/src/main/java/com/mindolph/mindmap/clipboard/ClipboardTopicsContainer.java b/code/mindmap-panel/src/main/java/com/mindolph/mindmap/clipboard/ClipboardTopicsContainer.java
index acb5d713..9260340f 100644
--- a/code/mindmap-panel/src/main/java/com/mindolph/mindmap/clipboard/ClipboardTopicsContainer.java
+++ b/code/mindmap-panel/src/main/java/com/mindolph/mindmap/clipboard/ClipboardTopicsContainer.java
@@ -1,6 +1,9 @@
 package com.mindolph.mindmap.clipboard;
 
-import com.igormaznitsa.mindmap.model.*;
+import com.igormaznitsa.mindmap.model.Extra;
+import com.igormaznitsa.mindmap.model.ExtraNote;
+import com.igormaznitsa.mindmap.model.ExtraTopic;
+import com.igormaznitsa.mindmap.model.MindMap;
 import com.mindolph.mindmap.model.TopicNode;
 import org.apache.commons.lang3.StringUtils;
 
@@ -18,7 +21,6 @@ public final class ClipboardTopicsContainer implements Serializable {
     private final TopicNode[] topics;
 
     /**
-     *
      * @param topics topics that don't have any ancestor-descendant relationship,
      *               otherwise any operations on these topics might with redundant topics.
      */
@@ -35,14 +37,8 @@ private static String oneLineTitle(TopicNode topic) {
     }
 
     public static String convertTopics(List<TopicNode> topics) {
-        StringBuilder result = new StringBuilder();
-        for (TopicNode t : topics) {
-            if (result.length() > 0) {
-                result.append(LINE_SEPARATOR);
-            }
-            result.append(convertTopic(t, 0));
-        }
-        return result.toString();
+        List<String> texts = topics.stream().map(topicNode -> convertTopic(topicNode, 0).trim()).toList();
+        return StringUtils.join(texts, LINE_SEPARATOR);
     }
 
     private static String convertTopic(TopicNode topic, int level) {
@@ -64,8 +60,7 @@ private static String convertTopic(TopicNode topic, int level) {
                     case NOTE: {
                         if (Boolean.parseBoolean(topic.getAttributes().get(ExtraNote.ATTR_ENCRYPTED))) {
                             result.append(LINE_SEPARATOR).append(lineIndent).append("<ENCRYPTED NOTE>");
-                        }
-                        else {
+                        } else {
                             for (String s : e.getValue().getAsString().split(LINE_SEPARATOR)) {
                                 result.append(LINE_SEPARATOR).append(lineIndent).append("> ").append(s.trim());
                             }