Custom GCode commands using e.g. G1 H2 moves collect data after the move finishes

[dc42]

When using a custom GCode command, if the command is a G1 H1 or G1 H2 movement then data is not collected until the move has finished. This is probably because RRF waits for these moves to complete before processing further commands. A workaround (I think) would be to send the data collection command before the custom command.