RecyclerView redraw content on onLayoutChildren()

Question

I'm using a custom LayoutManager for RecyclerView (FlowLayoutManager) that is working fine and this is the function used for laying out the children:

@Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state)
{

    detachAndScrapAttachedViews(recycler);

    final int count = this.getItemCount();
    views.clear();
    lines.clear();
    for (int i = 0; i < count; i++) {
        View child = recycler.getViewForPosition(i);
        addView(child);
        measureChildWithMargins(child, 0, 0);

        final LayoutParams lp = (LayoutParams) child.getLayoutParams();

        ViewDefinition view = new ViewDefinition(this.config, child);
        view.setWidth(child.getMeasuredWidth());
        view.setHeight(child.getMeasuredHeight());
        view.setNewLine(lp.isNewLine());
        view.setGravity(lp.getGravity());
        view.setWeight(lp.getWeight());
        view.setMargins(lp.leftMargin, lp.topMargin, lp.rightMargin, lp.bottomMargin);
        views.add(view);
    }


    this.config.setMaxWidth(this.getWidth() - this.getPaddingRight() - this.getPaddingLeft());
    this.config.setMaxHeight(this.getHeight() - this.getPaddingTop() - this.getPaddingBottom());
    this.config.setWidthMode(View.MeasureSpec.EXACTLY);
    this.config.setHeightMode(View.MeasureSpec.EXACTLY);
    this.config.setCheckCanFit(true);


    CommonLogic.fillLines(views, lines, config);
    CommonLogic.calculateLinesAndChildPosition(lines);


    int contentLength = 0;
    final int linesCount = lines.size();
    for (int i = 0; i < linesCount; i++) {
        LineDefinition l = lines.get(i);
        contentLength = Math.max(contentLength, l.getLineLength());
    }


    LineDefinition currentLine = lines.get(lines.size() - 1);
    int contentThickness = currentLine.getLineStartThickness() + currentLine.getLineThickness();
    int realControlLength = CommonLogic.findSize(this.config.getLengthMode(), this.config.getMaxLength(), contentLength);
    int realControlThickness = CommonLogic.findSize(this.config.getThicknessMode(), this.config.getMaxThickness(), contentThickness);


    CommonLogic.applyGravityToLines(lines, realControlLength, realControlThickness, config);


    for (int i = 0; i < linesCount; i++) {
        LineDefinition line = lines.get(i);
        applyPositionsToViews(line);
    }
}

The only issue is that when I call notifyDataSetChanges() or notifyItemChanges(), it calls onLayoutChildren() again and the whole recyclerview is changing it content and it scrolls right back to top.

I tried to see how LinearLayoutManager controls this issue but could not understand as much as I would like.

How do I keep the RecyclerView in its current state but only change the content ? Or how do I scroll to the same position I was ?