qgis - Why are the holes in my polygons not generalized?

I have one polygon layer with many holes. I would like to generalize it. I used v.generalize of grass. With it, I used chaiken algorithm. But, only the borders of polygons were generalized, the holes in them haven't smoothed their edges.

What can I do to smooth all edges (adding hole edges) of polygon?

Answer

I recommend you to use the brand new geoalgorithm from QGIS 2.14.1, named Smooth.py

With Smooth Geometry it's possible to smooth the entire polygon, not only the boundaries, as in Chaiken method from v.generalize