message: reverse the previous commit.
diff: @@ -279,18 +279,17 @@ Painter.prototype = {
  },
  addHover: function (el, hoverStyle) {
  - var elMirror = el.__hoverMir;
  - if (!elMirror) {
  - elMirror = new el.constructor({
  + if (el.__hoverMir) {
  + return;
  + }
  + var elMirror = new el.constructor({
  style: el.style,
  shape: el.shape
  });
  elMirror.__from = el;
  el.__hoverMir = elMirror;
  - this._hoverElements.push(elMirror);
  - }
  -
  elMirror.setStyle(hoverStyle);
  + this._hoverElements.push(elMirror);
  },
  removeHover: function (el) {
  