Action-related code (undo/redo, zoom, etc.).
- file edit_chord_action.h
- Action for changing chords in a ChordObject.
- file edit_marker_action.h
- Action for changing the Marker's name.
- file edit_midi_arranger_selections_action.h
- UndoableAction for MidiArrangerSelections edits.
- file edit_scale_action.h
- Action for changing scales in a ScaleObject.
- file edit_timeline_selections_action.h
- Action for editing objects in the timeline.
- file quantize_timeline_selections.h
- Action for quantizing the timeline selections.