mouse_drag event not firing correctly

[wieselkatze]

Even when moving the mouse in the pixel where the first mouse_click event was fired, mouse_drag events will occur.

Expected:

mouse_drag events only occuring when the mouse enters a new (CC) pixel.

[Thomas Farr]

Should be an easy fix

[Thomas Farr]

Only fire mouse_drag once the mouse leaves the origin mouse_click 'pixel'. fixes issue #21

→ <<cset b0562fa699be>>