SUMMARY Creation of the first frame on a layer is not undoable. For a 1-layer document it also means impossibility of accessing the undo history before the frame was created. STEPS TO REPRODUCE 1. Create a document with a single layer. 2. Draw several strokes on it. 3. Add a blank keyframe to it. 4. Press undo several times. OBSERVED RESULT All the strokes done in step 2 remain throughout the undoing. EXPECTED RESULT Undos allow to access all the intermediate states of the layer's history. Optionally, pressing undo once in step 4 (undoing the creation of the frame) should return the layer to a non-animated state SOFTWARE/OS VERSIONS Linux: Ubuntu 22.04 Qt Version: 5.15.7 Appimage
I can confirm the issue :(
This is not a regression. The issue is present in Krita 5.1.5