Rewrite mousePosition to accept an enum like mouseAction. HoverAction can be used to simply toggle isMousevariable style fields.
HoverTracker is a covnience wraper to ensure contract and simplicity of the required boolean to determine if the dislay is actually at the top.  Ensuring that only top windows bother to r4espond being hovered.
Import fixup, cause I can
Scroll MouseEvent to pass along user mouse scrolls. Apply DisplaySlider, works wonderfully.