message: fix svg text repeating problem
diff: @@ -411,6 +411,9 @@ define(function (require) {
  attr(tspan, 'alignment-baseline', verticalAlign);
  attr(tspan, 'text-anchor', textAnchor);
  }
  + else {
  + tspan.innerHTML = '';
  + }
  attr(tspan, 'x', x);
  attr(tspan, 'y', y + i * lineHeight + dy);
  tspan.appendChild(document.createTextNode(textLines[i]));
  