Please make the undo for decorations and the normal undo separate
and please make sampling a thing you can do without it ruining the undo, its annoying if you quickly want to make a new color but when you undo it does nothing because the sample was undo-ed (even though it does nothing)
also is ctrl-r used for something? if it isnt, add a redo?
i think ctrl-x is redo
No, ctrl+x is cut. Also the best key combination would be ctrl+y if that hasn't been used.