Tries to find a node which can be scrolled either x pixels to the right or y pixels down among the Elements in {nodes} and children of these Elements.

This function used to be recursive but isn't anymore due to various attempts at optimizing the function in order to reduce GC pressure.

Tries to scroll e by x and y pixels, with infinities representing the edges. Make the smooth scrolling animation last duration milliseconds.

Scroll continuously until scrollstop is called. Pass an x and y velocity, or just a y velocity. If only a single arg is passed, it will be treated as y (vertical scroll). Can also pass a multiplier, intented to be used as a numeric arg when :scrollstart is bound to a key.

Velocity unit = px/second

Call after scrollstart() to cease scrolling.