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text_margin<-fragment
text_margin <-fragment: event -> fragment
Find a fragment (-icon) from an event object. This method may be used to attach event-handling to the icons displayed on the margin. For example, the following recogniser will select a fragment by clicking on the icon: 
send(Editor?margin, recogniser,
         click_gesture(left, '', single,
                                   message(Editor, selected_fragment,
                                                   ?(@event?receiver, fragment,
                                                         @event)))).
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