GailTextUtil @parent: @buffer: @GAIL_BEFORE_OFFSET: @GAIL_AT_OFFSET: @GAIL_AFTER_OFFSET: @void: @Returns: @textutil: @text: @textutil: @buffer: @textutil: @layout: @function: @boundary_type: @offset: @start_offset: @end_offset: @Returns: @textutil: @start_pos: @end_pos: @Returns: