If user uses scroll bar to scroll, scrolling event handling breaks

[PabiGamito]

If a user uses the scroll bar to scroll on the website the scrolling event handler is no longer activated and therefore doesn't update the active website section. This causes it the break as, what the website thinks is the active section no longer is and therefore might cause scrolling to be blocked.

For instances, we have scrolled from the top of the website to the bottom of the website with the scrollbar. The active section, for the website, will still be the top most section, but we will actually be on the bottom most section. And therefore if we try to scroll up, the script thinking we are already in the top most section will simply do nothing. We would have to scroll down to get to the second section.