title: SpreadJs set border on a merged range
body: <p>I  would like to set a border on a merged range using spreadJs spreadsheet library, however I cannot get this to work.</p>
  
  <pre><code>const lineStyle = GC.Spread.Sheets.LineStyle;
  const lineBorder = GC.Spread.Sheets.LineBorder;
  const borderColor = 'rgb(255,0,0)';
  
  var option = {
      all: true
  };
  
  sheet
      .getRange(1, 1, 3, 2)
      .setBorder(new lineBorder(borderColor, lineStyle.thin), option);
  </code></pre>
  
  <p>Instead it is just doing the top left square, has anyone got any ideas?</p>
  
  <p><a href="https://i.stack.imgur.com/aSv19.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aSv19.png" alt="enter image description here"></a></p>