public void testRangeMarkersAreLazyCreated() throws Exception {
    final Document document = EditorFactory.getInstance().createDocument("[xxxxxxxxxxxxxx]");
    RangeMarker m1 = document.createRangeMarker(2, 4);
    RangeMarker m2 = document.createRangeMarker(2, 4);

    assertEquals(2, ((DocumentImpl) document).getRangeMarkersSize());
    assertEquals(1, ((DocumentImpl) document).getRangeMarkersNodeSize());

    RangeMarker m3 = document.createRangeMarker(2, 5);
    assertEquals(2, ((DocumentImpl) document).getRangeMarkersNodeSize());
    document.deleteString(4, 5);
    assertTrue(m1.isValid());
    assertTrue(m2.isValid());
    assertTrue(m3.isValid());
    assertEquals(1, ((DocumentImpl) document).getRangeMarkersNodeSize());

    m1.setGreedyToLeft(true);
    assertTrue(m1.isValid());
    assertEquals(3, ((DocumentImpl) document).getRangeMarkersSize());
    assertEquals(2, ((DocumentImpl) document).getRangeMarkersNodeSize());

    m3.dispose();
    assertTrue(m1.isValid());
    assertTrue(m2.isValid());
    assertFalse(m3.isValid());
    assertEquals(2, ((DocumentImpl) document).getRangeMarkersSize());
    assertEquals(2, ((DocumentImpl) document).getRangeMarkersNodeSize());
  }
  public void testValidationBug() throws Exception {
    Document document = EditorFactory.getInstance().createDocument("[xxxxxxxxxxxxxx]");
    final Editor editor = EditorFactory.getInstance().createEditor(document);

    try {
      final FoldRegion[] fold = new FoldRegion[1];
      editor
          .getFoldingModel()
          .runBatchFoldingOperation(
              new Runnable() {
                @Override
                public void run() {
                  fold[0] = editor.getFoldingModel().addFoldRegion(0, 2, "");
                }
              });
      RangeMarker marker = document.createRangeMarker(0, 2);
      document.deleteString(1, 2);

      assertTrue(marker.isValid());
      // assertFalse(fold[0].isValid());
    } finally {
      EditorFactory.getInstance().releaseEditor(editor);
    }
  }