Command to move to the previous trace in the sequence.
Creates an instance of MoveToPrevTraceCommand.
The context in which the move operation is performed.
Deactivates the virtual delta layer before switching.
Executes the move operation to step to the previous trace downward. The virtual delta layer is not a subplot layer, so it must be released first (reachable from braille mode, where PageDown stays bound).
Command to move to the previous trace in the sequence.