fix Enumeration<DefaultMutableTreeNode> for java 11

Author: massimozappino

example/pom.xml

@@ -12,6 +12,7 @@
             <groupId>com.tagmycode</groupId>
             <artifactId>tagmycode-plugin-framework</artifactId>
             <version>2.4.0-SNAPSHOT</version>
+            <scope>compile</scope>
         </dependency>
     </dependencies>
 

src/main/java/com/tagmycode/plugin/gui/form/FiltersPanelForm.java

@@ -100,7 +100,7 @@ private void selectLanguageOnTree(Language language) {
 
     private TreePath findPathForLanguages(DefaultMutableTreeNode root, Language language) {
         @SuppressWarnings("unchecked")
-        Enumeration<DefaultMutableTreeNode> e = root.depthFirstEnumeration();
+        Enumeration<DefaultMutableTreeNode> e = (Enumeration<DefaultMutableTreeNode>) (Object) root.depthFirstEnumeration();
         while (e.hasMoreElements()) {
             DefaultMutableTreeNode node = e.nextElement();
             Language currentLanguage = languageFromNode(node);