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