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Called to handle mouse events when this snip can handle events.
See
on-char and wx:const-snip-handles-events in
get-flags.
- (send a-wx:snip on-event dc x y mediax mediay event) -> void
dc : wx:dc% object
x : inexact real
y : inexact real
mediax : inexact real
mediay : inexact real
event : wx:mouse-event% object
PLT