cleanup

platform/platform-api/src/com/intellij/openapi/command/undo/BasicUndoableAction.java

@@ -46,10 +46,12 @@ public abstract class BasicUndoableAction implements UndoableAction {
     }
   }
 
+  @Override
   public DocumentReference[] getAffectedDocuments() {
     return myRefs;
   }
 
+  @Override
   public boolean isGlobal() {
     return false;
   }

platform/platform-api/src/com/intellij/openapi/command/undo/GlobalUndoableAction.java

@@ -36,6 +36,7 @@ public abstract class GlobalUndoableAction extends BasicUndoableAction {
     super(files);
   }
 
+  @Override
   public boolean isGlobal() {
     return true;
   }