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Emacs sometimes generates mouse motion events to describe motion of the mouse without any button activity. Mouse motion events are represented by lists that look like this:
(mouse-movement (window buffer-pos (x . y) timestamp))
The second element of the list describes the current position of the mouse, just as in a click event (see section 21.6.4 Click Events).
The special form
track-mouse enables generation of motion events
within its body. Outside of
track-mouse forms, Emacs does not
generate events for mere motion of the mouse, and these events do not
appear. See section 29.13 Mouse Tracking.
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