Undo history is a list of a sprite's states. A new state is saved each time an action is done to the sprite. When you use Edit > Undo (Ctrl+Z) or Edit > Redo (Ctrl+Y), you are moving back and forth through this list of states.
The undo history memory limit can be changed in the preferences menu.
The undo history menu shows the sprite's undo history. It can be accessed with Edit > Undo History.
Clicking on an entry changes the sprite's current state to the one that was clicked. After an action on the sprite (creating a new entry), the state either adds to or replaces the states in front of it depending on the non-linear undo history setting.
By default the Undo History acts linearly: when Undo is used (which moves the current sprite state back one entry), the next action will erase all steps that can be redone. If this Non-Linear History is enabled and Undo is used, the next action will add the new sprite state to the list, keeping the old one intact.
Non-Linear Undo History can be toggled on/off in the preferences menu.
| Enabled | Disabled |
|---|---|
 |
 |
SEE ALSO