How do I get the active selection into python?

If I make a rectangular selection with mouse and try

Code: Select all

Selection().width()

it returns 0, which is fair enough because I assume I just made up a selection that has no selected pixels.

Answer seems to be found in here: https://forum.kde.org/viewtopic.php?f=156&t=156407&p=410512&hilit=selection#p410512