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UsdLayerManager/openspec/changes/undo-redo-scene-editing/specs/undoable-layer-ops/spec.md

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ADDED Requirements

Requirement: Sublayer creation is undoable

The system SHALL push a LayerCreateCommand to CommandHistory when a new sublayer is created via the Layer panel. Undo() SHALL remove the sublayer from the layer stack. Redo() SHALL re-add it at the same position.

Scenario: Undo removes created sublayer

  • WHEN the user creates a sublayer and then presses Ctrl+Z
  • THEN the sublayer is no longer in the layer stack

Requirement: Sublayer removal is undoable

The system SHALL push a LayerRemoveCommand to CommandHistory when a sublayer is removed via the Layer panel. Undo() SHALL re-insert the layer path at its original index. Redo() SHALL remove it again.

Scenario: Undo restores removed sublayer

  • WHEN the user removes a sublayer and then presses Ctrl+Z
  • THEN the sublayer reappears at its original position in the stack

Requirement: Sublayer reorder is undoable

The system SHALL push a LayerReorderCommand to CommandHistory when sublayers are reordered (moved up or moved down) in the Layer panel. The command SHALL store the full ordered list before and after. Undo() SHALL restore the previous order.

Scenario: Undo reverts move-up

  • WHEN the user moves a sublayer up and then presses Ctrl+Z
  • THEN the layer returns to its previous position in the stack