Ralf Mardorf schreef op 03-12-2017 20:47: > Btw. take a look at GIMP, it provides an undo history with thumbnails. > You don't need to undo step by step, you could ignore ten or more undo > steps and chose to revert to undo step 11 or any other. It still doesn't keep a tree and an accidental change will wipe your redo buffer. Like in other (text-editing) programs.