Undo re-toggles the preview for all frames, and erases a bit of the bottom of all frames

[Matiaz21]

Steps to reproduce the bug

1. go to piskelapp.com
2. add more than one frame
3. toggle all frames for preview except for one (so only one frame is shown in the preview box)
4. begin drawing on the frame which is being shown in the preview
5. press ctrl-z to undo some of your drawing, may take more than one times.
6. you will see that all frames have been re-enabled to show on the preview. you may say that 'well you are undoing the action of disabling the frame' however I have noticed that the order is totally ignored. say you draw a pixel then disable a frame then draw a second and third pixels. undoing twice should just undo the third and second drawn pixels, however I have noticed in this situation the disabled frames would be re-enabled for preview.

Environment details

• operating system: windows 10
• browser (or offline application version): microsoft edge

Sprite details

• number of frames: 224
• sprite resolution: 24x24
• session duration: 15 minutes