IEditor: Make duplicatesSupported a value member

Change-Id: Iee75dd4155d5074bb319df79d006b6d5e2989e14
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/android/javaeditor.cpp

@@ -54,6 +54,7 @@ JavaEditor::JavaEditor(JavaEditorWidget *editor)
 {
     setContext(Core::Context(Constants::C_JAVA_EDITOR,
               TextEditor::Constants::C_TEXTEDITOR));
+    setDuplicateSupported(true);
 }
 
 Core::IEditor *JavaEditor::duplicate()