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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def restore_scrollbar_position(self):

 """Restoring scrollbar position after main window is visible"""

        scrollbar_pos = self.get_option('scrollbar_position', None)
        if scrollbar_pos is not None:
            self.explorer.treewidget.set_scrollbar_position(scrollbar_pos)