Selections to be used for the AudioArrangerWidget's current selections, copying, undoing, etc.
- bool has_selection
- Whether or not a selection exists.
- Position sel_start
- Selected range.
- int pool_id
- Audio pool ID of the associated audio file, used during serialization.
- RegionIdentifier region_id
- Identifier of the current region.
Audio pool ID of the associated audio file, used during serialization.
Set to -1 if unused.
Identifier of the current region.
Other types of selections don't need this since their objects refer to it.