This is a weird bug, this only happens after opening/loading ORA files. Triggering "Undo" does not update the canvas and the last action is still visible (ie. a stroke). This happens regardless of canvas type (openGL/CPU). The undo is performed however the canvas is never updated. Tested to happen on master (92b3dc5676) tested on macOS and Windows STEPS TO REPRODUCE 1. open an ORA file 2. paint 3. Undo OBSERVED RESULT Nothing happens EXPECTED RESULT The document display is reset to the current state