Undo, Redo & History

• LoongScales uses command-based undo: every operation (a brush stroke, a move, a parameter change, an AI generation…) goes into the history stack.
• Ctrl+Z to undo, Ctrl+Y or Ctrl+Shift+Z to redo.
• Consecutive same-type operations (e.g. consecutive brush strokes) are auto-merged to reduce undo steps.
• History has a memory budget; an over-long chain auto-discards the earliest steps; AI operations can also be fully undone (e.g. after background removal you can Ctrl+Z to restore the original).