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Issue created by Administrator@rootContributor

ScrollSpy no longer selects last element when at the bottom of the page

Created by: timfish

This was added in v2.0.3 but appears broken with v4-alpha and ScrollSpy attached to the <body>. The last item is not selected when you scroll to the bottom of the page.

var maxScroll = this._config.offset + scrollHeight - this._scrollElement.offsetHeight;

The issue appears to be that maxScroll is Nan because this._scrollElement.offsetHeight is undefined

this._scrollElement = element.tagName === 'BODY' ? window : element;

As I'm using the <body> element this._scrollElement is window