Prevent v-table Overscroll (WIP)

[Gregg8]

As stated here, currently, scrolling a v-table also scrolls parent scrollbars (usually the one on [:body]).

The solution seems to be to use the relatively new CSS :overscroll-behavior.

Couldn't get it to work, however. Get back to this when we have more time.

Another reference page: https://developers.google.com/web/updates/2017/11/overscroll-behavior

[flybot-nam-nguyenhoai]

I think this issue causes V-tables to be very difficult to use, and so probably deserves more attention.

The first thing I noticed when trying to add :overscroll-behavior myself was that re-com.validate/css-styles does not yet contain this option.

Also, even with :max-rows turned off and :parent-height specified (so no virtualization), scrolling a V-table still causes overscrolling on the parent.