Surely it has already been requested and if it is the case, I put it again as a feature to add.
Instead of going steps backwards, I think it is useful to have a popup window with all the actions done from the beginning on an image and return to any point by clicking on the item in this list. Furthermore, a variant can also be created from an item in the list.
For example, if we have 5 actions applied (white balance, lens correction, contrast, b & w, and grain additive) we could go to contrast and from that item create a variant (with its own history)
However, if we position ourselves in contrast and continue editing on the same image, for example, we apply sharpness and a gradient layer, the actions from contrast will be replaced by the new ones.
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