proto._reset = function() {
utils.forEach(this._packs, dom.removeElement);
this._packs = [];
this.clearSelection();
this._allreadyResized = false;
if (this._scrollableParent())
this._scrollableParent().removeListener('scroll', utils.bindOnce(this._scroll, this));
};
proto._visChanged = function() {
var packNs = this._packsToRender(),
revision = env.guid++;
for (var packN=packNs[0]; packN <= packNs[1]; packN++) {
if (!this._packs[packN]) {
this._schedulePackRender(packN, revision);
} else {
this._packs[packN].__revision = revision;
}
};
utils.forEach(this._packs, function(p, packN) {
if (p.__revision != revision) this._removePack(packN);
}, this);
};