message: do not trigger scroll event if x and y are not change
diff: @@ -551,10 +551,6 @@ export function coreMixin(BScroll) {
  }
  BScroll.prototype.scrollTo = function (x, y, time = 0, easing = ease.bounce) {
  - if (x === this.x && y === this.y) {
  - return
  - }
  -
  this.isInTransition = this.options.useTransition && time > 0 && (x !== this.x || y !== this.y)
  if (!time || this.options.useTransition) {
  @@ -566,7 +562,7 @@ export function coreMixin(BScroll) {
  this._startProbe()
  }
  - if (!time) {
  + if (!time && (x !== this.x || y !== this.y)) {
  this.trigger('scroll', {
  x,
  y
  