Float the info panel's "Show in chat tab" link in its corner

As a real label over the text, it stays reachable however long a description
runs, instead of trailing off the end of it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ts3-client/swing/src/main/java/com/ts3client/ui/InfoPanel.java

@@ -9,7 +9,16 @@ import com.ts3client.text.BBCode;
 
 import javax.swing.BorderFactory;
 import javax.swing.JEditorPane;
+import javax.swing.JLabel;
+import javax.swing.JLayeredPane;
+import javax.swing.JPanel;
 import javax.swing.JScrollPane;
+import java.awt.BorderLayout;
+import java.awt.Cursor;
+import java.awt.Dimension;
+import java.awt.Insets;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
 import java.io.File;
 import java.util.List;
 
@@ -18,7 +27,7 @@ import java.util.List;
  * the TeamSpeak 3 info box: channel topic/description, or a client's server and
  * channel groups, platform and version.
  */
-public final class InfoPanel extends JScrollPane {
+public final class InfoPanel extends JPanel {
 
     /** Moves the whole info panel's content out to a persistent chat tab. */
     public interface DescriptionHandler {
@@ -32,9 +41,13 @@ public final class InfoPanel extends JScrollPane {
         void setPanelHidden(boolean hidden);
     }
 
-    private static final String TOGGLE_HREF = "app:toggle-info-tab";
+    /** Gap between the floating link and the panel's edges. */
+    private static final int TOGGLE_MARGIN = 6;
 
     private final JEditorPane pane = HtmlStyles.pane("font-family:sans-serif; font-size:11px;");
+    private final JScrollPane scroll = new JScrollPane(pane);
+    /** Floats over the bottom-right corner of the details, out of the text's way. */
+    private final JLabel toggle = new JLabel("Show in chat tab");
     private DescriptionHandler descriptionHandler;
     private ChannelNode shownChannel;
     private ClientEntry shownClient;
@@ -43,26 +56,57 @@ public final class InfoPanel extends JScrollPane {
     private boolean inChatTab;
 
     public InfoPanel() {
+        super(new BorderLayout());
         pane.setBorder(BorderFactory.createEmptyBorder(6, 8, 6, 8));
         pane.addHyperlinkListener(e -> {
             if (e.getEventType() != javax.swing.event.HyperlinkEvent.EventType.ACTIVATED) return;
-            if (TOGGLE_HREF.equals(e.getDescription())) {
+            Links.open(e.getDescription(), this);
-                inChatTab = !inChatTab;
+        });
-                if (!inChatTab && descriptionHandler != null) descriptionHandler.closeInfoTab();
+        HtmlStyles.fillViewport(pane);
+
+        toggle.setFont(Theme.uiSmall());
+        toggle.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
+        toggle.setToolTipText("Show these details in a chat tab instead");
+        toggle.setOpaque(true);
+        toggle.setBorder(BorderFactory.createEmptyBorder(1, 4, 1, 4));
+        toggle.addMouseListener(new MouseAdapter() {
+            @Override
+            public void mousePressed(MouseEvent e) {
+                inChatTab = true;
                 render();
-            } else {
-                Links.open(e.getDescription(), this);
             }
         });
-        setViewportView(pane);
+
-        HtmlStyles.fillViewport(pane);
+        // The link floats on top of the text rather than following it, so it stays
+        // in the corner however long the description is.
+        JLayeredPane layers = new JLayeredPane() {
+            @Override
+            public void doLayout() {
+                scroll.setBounds(0, 0, getWidth(), getHeight());
+                Insets in = scroll.getInsets();
+                Dimension d = toggle.getPreferredSize();
+                toggle.setBounds(getWidth() - in.right - TOGGLE_MARGIN - d.width,
+                        getHeight() - in.bottom - TOGGLE_MARGIN - d.height, d.width, d.height);
+            }
+        };
+        layers.add(scroll, JLayeredPane.DEFAULT_LAYER);
+        layers.add(toggle, JLayeredPane.PALETTE_LAYER);
+        add(layers, BorderLayout.CENTER);
+        applyTheme();
         clear();
     }
 
     @Override
     public void updateUI() {
         super.updateUI();
-        setBorder(BorderFactory.createLineBorder(Theme.border()));
+        // Runs from the superclass constructor too, before our own fields exist.
+        if (scroll != null) applyTheme();
+    }
+
+    private void applyTheme() {
+        scroll.setBorder(BorderFactory.createLineBorder(Theme.border()));
+        toggle.setBackground(pane.getBackground());
+        toggle.setForeground(Theme.link());
     }
 
     public void clear() {
@@ -100,10 +144,11 @@ public final class InfoPanel extends JScrollPane {
         boolean selected = shownChannel != null || shownClient != null;
         boolean hide = inChatTab && selected;
         if (descriptionHandler != null) descriptionHandler.setPanelHidden(hide);
+        toggle.setVisible(selected && !hide);
         if (hide) {
             descriptionHandler.showInfoTab(body(), this::onInfoTabClosed);
         } else {
-            setHtml(body() + (selected ? toggleLink(true) : ""));
+            setHtml(body());
         }
     }
 
@@ -172,12 +217,6 @@ public final class InfoPanel extends JScrollPane {
         return sb.toString();
     }
 
-    /** The link that toggles between showing details here and in a chat tab. */
-    private static String toggleLink(boolean toChat) {
-        return "<div style='margin-top:8px'><a href='" + TOGGLE_HREF + "' style='font-size:10px'>"
-                + (toChat ? "Show in chat tab" : "Show here") + "</a></div>";
-    }
-
     private void setHtml(String body) {
         pane.setText("<html><body>" + body + "</body></html>");
         pane.setCaretPosition(0);