8524187869
Previously, when scrolling the ToC and reaching the top/bottom, further
mousewheel events would result in scrolling the window (and thus the main
content). This is standard browser behavior. In the case of the ToC though, the
`ScrollSpy` would detect scrolling in the main content and scroll the active ToC
to entry into view, thus resetting the scroll position of the ToC.
Reproduction:
1. Open `~/guide/template-syntax`.
2. Start scrolling through the long ToC.
3. Try to go to the bottom of the ToC.
4. Once you reach the bottom, the main content starts scrolling down.
5. The first section ("HTML in templates") becomes "active", so the ToC is
scrolled back up to make its corresponding entry visible.
6. Go back to step 2.
This commit improves the UX, by not allowing the main content to scroll when the
cursor is ovr the ToC and the user has scrolled all the way to the top/bottom of
it.
Safari (7+), iOS (7+), Edge (14) and IE mobile (11) are tested on BrowserStack.
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