QGIS autocomplete polygon

One of the things that I missed about ESRI ARCGIS in my mind was the ability to autocomplete a polygon, this is to draw another polygon by just drawing exactly one edge as the other edges were already defined by previous polygons. I didn’t want to go again over the edges for two reasons:

1. It is time consuming
2. It is prone to errors including gaps or overlaps

I thought that this was missing when in reality it is there just not in a specific button like in ArcGIS desktop but setting a snapping preference to not allow overlaps. Quite simple and quick

Here is a demonstration and I hope this helps you in your workflow