#19 trigger list in effect editor doesn't update

[DiGiT]

1) Load a scenario with multiple triggers.
2) Edit an "Activate Trigger" effect. (Leave editor open.)
3) Add a new trigger to the scenario.
4) Edit Effect dialog doesn't see the new trigger.

[DiGiT]

Fixing this would require architectural changes. It's easy to work around (just close & re-open effect editor), so I'm making it a low priority.