Make single-file containers not expand

Author: rcx

src/main/java/club/bytecode/the/jda/gui/navigation/FileNavigationPane.java

@@ -230,7 +230,7 @@ public FileNode addTreeElement(FileContainer container, FileNode parent) {
         JDATreeCellRenderer renderer = new JDATreeCellRenderer();
         tree.setCellRenderer(renderer);
 
-        if (!container.files.isEmpty()) {
+        if (container.files.size() > 1) {
             for (final Entry<String, byte[]> entry : container.files.entrySet()) {
                 String name = entry.getKey();
                 final String[] spl = name.split("/");
@@ -434,6 +434,11 @@ public void openPath(TreePath path) {
             }
         }
 
+        // single-file thang
+        if (container.files.size() == 1 && nameBuffer.length() == 0) {
+            nameBuffer.append(container.files.keySet().iterator().next());
+        }
+
         String name = nameBuffer.toString();
         if (name.endsWith(".class")) {
             final ClassNode cn = container.loadClass(name);