Scrolling broken when cursor hovering over overflowing textarea

[tibineagu]

• [x] Check FAQ and Caveats
• [x] Search if there's already one reported in Issues
• [x] Prepare a JSFiddle reproducing the issue
  • perfect-scrollbar JSFiddle
• [x] Provide a page or source code where the issue can be checked

Codesandbox Demo here

Steps to reproduce:

• Have a container using PerfectScrollbar
• Inside the container, have a <textarea> where the text overflows the maximum height of the textarea element, and therefore it has a scrollbar of its own)
• The content inside the container must be more than its maximum height, in order for the PerfectScrollbar bars to appear
• Scroll over the container
• As the container scrolls, the cursor will end up over the textarea
• Notice how the scroll starts acting strange, either when scrolling up or down, depending on whether the textarea is scrolled all the way to the top or to the bottom
• The wheelPropagation option does nothing to alleviate this issue
• If you hold your cursor anywhere outside the textarea, scroll still functions as expected

[tibineagu]

@filipkappa @marveluck I've opened https://github.com/mdbootstrap/perfect-scrollbar/pull/140 to address this.