not exactly what you ask but you have two options here:
1) select all the clips you want to merge and hit Clip > Merge... ;
2) go to Track > Export Tracks > MIDI... and select the MIDI output bus your tracks belong to;
both options ask for the .mid file that will go with the merged MIDI data.
see also View > Options... > MIDI > Capture / Export > File format options.
not exactly what you ask but you have two options here:
1) select all the clips you want to merge and hit Clip > Merge... ;
2) go to Track > Export Tracks > MIDI... and select the MIDI output bus your tracks belong to;
both options ask for the .mid file that will go with the merged MIDI data.
see also View > Options... > MIDI > Capture / Export > File format options.
cheers
and happy new year!