Hi Dmitry,<br><br>Testing your branch, globally it works great.<br><br>Found a little undo bug:<br>-Create a group layer<br>-inside, create 3 empty layers, draw something on each<br>-On the group layer, do "Flatten layer".<br>
-Undo<br>->the bottom layer in the group "disappear" from canvas, just toggle its visibility off/on to see it again.<br>