oldRange = new Range(commonPrefix, model.getLineMaxColumn(commonPrefix), modelLineCount, model.getLineMaxColumn(modelLineCount));
newRange = new Range(commonPrefix, 1 + textBuffer.getLineLength(commonPrefix), textBufferLineCount, 1 + textBuffer.getLineLength(textBufferLineCount));
oldRange = new Range(1, 1, modelLineCount, model.getLineMaxColumn(modelLineCount));
newRange = new Range(1, 1, textBufferLineCount, 1 + textBuffer.getLineLength(textBufferLineCount));