Bug: in demo page variable heights is not working

[LucaGabi]

Here: https://clauderic.github.io/react-tiny-virtual-list/ dragging the scroll lets the scroll indicator behind the mouse when using variable heights.

[Yeti-or]

also on page https://clauderic.github.io/react-tiny-virtual-list/#/basic-setup/elements-of-equal-height if slider is set not to default