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graphical->in_event_area
graphical ->in_event_area: x=int, y=int
Used by class device to determine device<-pointed_objects. Performs the following steps:

  1. if the width or height is very small (< 5 pixels), it is enlarged to make it at least 5 pixels. Fails if (X,Y) is outside this (enlarged) area. The tolerance is read from the graphical.event_tolerance.
  2. if the class has the C-function‘class -in_event_area_function’defined, this function is called and its value is returned. Otherwise success is returned.

    Bugs: # The 5 pixels should be a resource

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