fix(scroll-handler): only update scroll handler length when elements array changes #128
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I noticed that
vertical-collectionthrows an error when you load 2 instances on the same page:scroll-handler.js:96 Uncaught TypeError: Cannot read property 'scrollTop' of undefinedThis was because
this.lengthdidn't match the number of elements inthis.elementswhenaddElementHandleris called twice with the sameelement(TheContainer)