So here is the patch to implement that:
- Select an order.
- Enable full-load by pushing the full-load button. Whether this initially is full-load any or full-load all cargo depends on the global patch setting (the GUI shows you which).
- CTRL-click on the full-load button to toggle between full-load any and full-load all.
In the thread mentioned above it was discussed, whether it should be possible to select which cargo should be filled. I did not implement this for several reasons:
- I wanted to take a step-by-step approach and I think this would be an advanced step
- I was quite sure how to do this first step, but would have to think a bit about the selection by cargo
- I am not so sure anymore that such a feature would really be such a good thing as orders may be shared among vehicles with different cargos.