1.10.1.3.2.14.  Sketcher: Undo/redo function

V12 gives the Sketcher an undo/redo [Restore] function [Undo].

In both buttons there is a list field integrated, which shows the possible steps. When clicking on a list item you will automatically jump to the corresponding state and so possibly save dozens of single steps.

In the course of the change the button for the deletion of a single step changed.