By reverting the image to the state saved on disk, you will lose all changes, including all undo information.
Ma thilleas tu an dealbh gun staid a chaidh a shàbhaladh air an diosga, caillidh tu rud sam bhith a dh'atharraich thu ann, a' gabhail a-steach fiosrachadh neo-dhèanamh nan gnìomhan air fad.