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give access to the current position of the mouse.
(frame x . y), where x and y are integers giving the position in characters relative to the top left corner of the inside of frame.
nil, the value of this variable is a function for
mouse-positioncalls this function just before returning, with its normal return value as the sole argument, and it returns whatever this function returns to it.
This abnormal hook exists for the benefit of packages like `xt-mouse.el' that need to do mouse handling at the Lisp level.
mouse-positionexcept that it returns coordinates in units of pixels rather than units of characters.
set-mouse-positionexcept that x and y are in units of pixels rather than units of characters. These coordinates are not required to be within the frame.
If frame is not visible, this function does nothing. The return value is not significant.
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