DT 2.6.0 retouch, clone and shapes

When you do perspective correction or crop and rotate it is very common to get black border areas. Often you would want to fill these areas by cloning other parts the image to avoid to crop the image too much. How can you do this in DT?

The black border areas are apparently not considered to be part of the image but simply empty areas. So the only solution seems to be to do perspective correction, export the image and import it again. Now the black areas can be cloned!

The retouch module uses shapes. How can you use the shapes already recorded in the mask manager?