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* `on.mouse_move(x,y, dx,dy, istouch)` -- called when you move the mouse.
Provides in `x` and `y` the point on the screen at which the click occurred
and in `dx` and `dy` the amount moved since the previous call of
`mouse_move`.
(Based on [LÖVE](https://love2d.org/wiki/love.mousemoved).)