wplot_seekleft

           Button to navigate in data and find next data point

           cafe

           +seekleft+

           wplot button

           "<-"

           Shift left, till data point in current group found. If no
           data left present do nothing. If shift distance is
           less than 1/4 of screen we move 1/4 of screen left.
           Only data of current group will be taken into account.

           Changes xposition of displayed plot.

           $Id: cafe_wplot_seekleft.pro,v 1.11 2003/11/04 14:27:38 goehler Exp $

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