fSourceRegion.getOffset() == command.offset && fSourceRegion.getLength() == command.length;
fSourceRegion.getOffset() + fSourceRegion.getLength() == command.offset && command.length > 0;
	private boolean isDelete(DocumentCommand command) {		return			(command.text == null || command.text.length() == 0) &&			fSourceRegion.getOffset() == command.offset && fSourceRegion.getLength() == command.length;	}