question: public final boolean split_traces_keep_point ( ) { if ( keep_point == null ) return false ; ItemSelectionFilter filter = new ItemSelectionFilter ( ItemSelectionChoice . TRACES ) ; Collection < BrdItem > picked_items = r_board . pick_items ( keep_point . keep_point , keep_point . on_layer , filter ) ; for ( BrdItem curr_item : picked_items ) { BrdTracep a_trace = ( BrdTracep ) curr_item ; int line_idx = a_trace . polyline_find_line_idx ( keep_point . keep_point ) ; if ( line_idx < 1 ) continue ; ArrayList < BrdTracep > clean_list = a_trace . split_with_end_point ( line_idx , keep_point . keep_point ) ; return clean_list . size ( ) > 0 ; } return false ; }
target:  Splits the traces containing this.keep_point if this.keep_point != null This actually splits the trace since lower down pieces are inserted in the board, if successful