message: fix shorty line can't be drew in sankey
diff: @@ -35,6 +35,8 @@ Path.prototype = {
  strokeContainThreshold: 5,
  + segmentIgnoreThreshold: false,
  +
  /**
  * See `module:zrender/src/graphic/helper/subPixelOptimize`.
  * @type {boolean}
  @@ -90,7 +92,7 @@ Path.prototype = {
  // Update path sx, sy
  var scale = this.getGlobalScale();
  - path.setScale(scale[0], scale[1]);
  + this.segmentIgnoreThreshold !== false && path.setScale(scale[0], scale[1]);
  // Proxy context
  // Rebuild path in following 2 cases
  