0a895ffefcf9e3888710ec575547d767b2904541,src/main/java/com/net2plan/gui/utils/UndoRedoManager.java,UndoRedoManager,getNavigationBackElement,#,78

Before Change


        if (pastInfoVsNewNpCursor == 0) return null;
        this.pastInfoVsNewNpCursor--;
        final TimelineState currentState = pastInfoVsNewNp.get(this.pastInfoVsNewNpCursor);
        final Triple<NetPlan, BidiMap<NetworkLayer, Integer>, Map<NetworkLayer, Boolean>> stateDefinition = currentState.getStateDefinition();

        // Making a copy of the current state
        // This is made so that in case we go back and make a change, we are able to save the state before then change.
        // By reference copying is not useful in this case.
        this.backupState = new TimelineState(stateDefinition.getFirst().copy(), new DualHashBidiMap<>(stateDefinition.getSecond()), new HashMap<>(stateDefinition.getThird()));
        return stateDefinition;
    }

    /**

After Change


        this.pastInfoVsNewNpCursor--;

        final TimelineState currentState = pastInfoVsNewNp.get(this.pastInfoVsNewNpCursor);
        this.backupState = createState(currentState.getStateDefinition().getFirst());

        return currentState.getStateDefinition();
    }