private class DefineFoldingRegionAction extends TextEditorAction {

		public DefineFoldingRegionAction(ResourceBundle bundle, String prefix, ITextEditor editor) {
			super(bundle, prefix, editor);
		}

		private IAnnotationModel getAnnotationModel(ITextEditor editor) {
			return (IAnnotationModel)editor.getAdapter(ProjectionAnnotationModel.class);
		}

		/*
		 * @see org.eclipse.jface.action.Action#run()
		 */
		public void run() {
			ITextEditor editor= getTextEditor();
			ISelection selection= editor.getSelectionProvider().getSelection();
			if (selection instanceof ITextSelection) {
				ITextSelection textSelection= (ITextSelection)selection;
				if (!textSelection.isEmpty()) {
					IAnnotationModel model= getAnnotationModel(editor);
					if (model != null) {

						int start= textSelection.getStartLine();
						int end= textSelection.getEndLine();

						try {
							IDocument document= editor.getDocumentProvider().getDocument(editor.getEditorInput());
							int offset= document.getLineOffset(start);
							int endOffset= document.getLineOffset(end) + document.getLineLength(end); // bug fix
							Iterator e= model.getAnnotationIterator(); // added
							while (e.hasNext()) { // added
								ProjectionAnnotation annotation= (ProjectionAnnotation)e.next(); // added
								if (model.getPosition(annotation).getOffset() == offset) // added
									model.removeAnnotation(annotation); // added
							} // added
							if (end > start) { // added
								Position position= new Position(offset, endOffset - offset);
								model.addAnnotation(new ProjectionAnnotation(), position);
							} // added
						} catch (BadLocationException x) {
							// ignore
						}
					}
				}
			}
		}
	}